mirror of https://git.ffmpeg.org/ffmpeg.git
avcodec/rl2: Remove wrong check
This check is intended to be avoid buffer overflows, yet there are four problems with it: 1. It has an in-built off-by-one error: len == out_end - out is perfectly fine and nothing to worry about. This off-by-one error led to the pixel in the lower-right corner not being set properly for the back frame of the sample from the rl2 FATE-test. This pixel is copied to every frame which is the reason for the update to the reference file of said test. With this patch, the output of the decoder matches the output as captured from the reference decoder* (apart from the fact that said reference somehow lacks the top part of the frame (copied over from the background frame)). 2. Given that the stride of the buffer may be different from the width of the video (despite one pixel taking one byte), there is a second check lateron making the first check redundant (if one returns immediately; a simple break at the second check is not sufficient, because it only exits the inner loop). 3. The check is based around the assumption of the stride being positive (it has this in common with the other check which will be fixed in a future commit). 4. Even after fixing the off-by-one error, the check in question is still triggered by all the non-background frames in the FATE sample as well as by A1100100.RL2. In all these cases, they use len == 255 and val == 128. For videos with background frame this just means "copy from the background frame", which would be done anyway lateron.* Yet for videos without it copying it is necessary to avoid leaving uninitialized parts in the video. *: Available in https://samples.mplayerhq.hu/game-formats/voyeur-rl2/ **: Due to this, the code that copies the rest from the back frame is no longer executed for any of the samples available on the sample server. Given that these are only the files from the demo version of this game, I don't know whether this code is executed for any file in existence or not. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
parent
7eed125dbb
commit
98aaaf08b3
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@ -91,9 +91,6 @@ static void rl2_rle_decode(Rl2Context *s, const uint8_t *in, int size,
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break;
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}
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if (len >= out_end - out)
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break;
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if (s->back_frame)
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val |= 0x80;
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else
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@ -106,7 +103,7 @@ static void rl2_rle_decode(Rl2Context *s, const uint8_t *in, int size,
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out += stride_adj;
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line_end += stride;
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if (len >= out_end - out)
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break;
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return;
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}
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}
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}
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@ -3,111 +3,111 @@
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#codec_id 0: rawvideo
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#dimensions 0: 320x200
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#sar 0: 0/1
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0, 0, 0, 1, 192000, 0x7112a667
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0, 1, 1, 1, 192000, 0x6936abf3
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0, 2, 2, 1, 192000, 0xb1f08981
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0, 3, 3, 1, 192000, 0x4ce7fece
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0, 4, 4, 1, 192000, 0xf04decde
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0, 5, 5, 1, 192000, 0x47fef74b
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0, 6, 6, 1, 192000, 0x99b42ac2
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0, 7, 7, 1, 192000, 0x3c4c419d
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0, 8, 8, 1, 192000, 0x66bf5588
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0, 9, 9, 1, 192000, 0xe1de4725
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0, 10, 10, 1, 192000, 0x348b2af9
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0, 11, 11, 1, 192000, 0x1ce73e83
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0, 12, 12, 1, 192000, 0xcdaa6e02
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0, 13, 13, 1, 192000, 0x370dc2ce
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0, 14, 14, 1, 192000, 0x1e1e40fe
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0, 15, 15, 1, 192000, 0x491470a4
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0, 16, 16, 1, 192000, 0x88c43e9a
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0, 17, 17, 1, 192000, 0x036f3f44
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0, 18, 18, 1, 192000, 0xc8be7e25
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0, 19, 19, 1, 192000, 0xbedb397d
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0, 20, 20, 1, 192000, 0x97c410f4
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0, 21, 21, 1, 192000, 0xc2c8225d
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0, 22, 22, 1, 192000, 0xe396bccb
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0, 23, 23, 1, 192000, 0x7e89c24c
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0, 24, 24, 1, 192000, 0xb044954c
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0, 25, 25, 1, 192000, 0x335890dd
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0, 26, 26, 1, 192000, 0x58a457c0
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0, 27, 27, 1, 192000, 0xeb0f4798
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0, 28, 28, 1, 192000, 0x0bfc39a1
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0, 29, 29, 1, 192000, 0x06a6905a
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0, 30, 30, 1, 192000, 0x5300c99b
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0, 31, 31, 1, 192000, 0x38f3f845
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0, 32, 32, 1, 192000, 0x6afa3543
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0, 33, 33, 1, 192000, 0x5106a8e0
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0, 34, 34, 1, 192000, 0xc76f0dab
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0, 35, 35, 1, 192000, 0x8efa6939
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0, 36, 36, 1, 192000, 0x64ea23d7
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0, 37, 37, 1, 192000, 0x421a2817
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0, 38, 38, 1, 192000, 0xc854fa18
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0, 39, 39, 1, 192000, 0x4a10d59c
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0, 40, 40, 1, 192000, 0x72637829
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0, 41, 41, 1, 192000, 0xdbbe2796
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0, 42, 42, 1, 192000, 0xff742e6b
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0, 43, 43, 1, 192000, 0xf94b9346
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0, 44, 44, 1, 192000, 0xc90ea53c
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0, 45, 45, 1, 192000, 0x177483bb
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0, 46, 46, 1, 192000, 0x3510369c
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0, 47, 47, 1, 192000, 0x501034bf
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0, 48, 48, 1, 192000, 0x315c744b
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0, 49, 49, 1, 192000, 0xdb5048ae
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0, 50, 50, 1, 192000, 0x09a86221
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0, 51, 51, 1, 192000, 0xb9c9568a
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0, 52, 52, 1, 192000, 0x5eee665b
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0, 53, 53, 1, 192000, 0xdef85517
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0, 54, 54, 1, 192000, 0x7896b5ad
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0, 55, 55, 1, 192000, 0x19fbad39
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0, 56, 56, 1, 192000, 0x63358748
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0, 57, 57, 1, 192000, 0xca0196a3
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0, 58, 58, 1, 192000, 0x0b321da3
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0, 59, 59, 1, 192000, 0xa07af07e
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0, 60, 60, 1, 192000, 0x21f9310c
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0, 61, 61, 1, 192000, 0x62d59874
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0, 62, 62, 1, 192000, 0x021227b4
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0, 63, 63, 1, 192000, 0x01dac0c2
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0, 64, 64, 1, 192000, 0xf3c33a74
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0, 65, 65, 1, 192000, 0xeebe83b7
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0, 66, 66, 1, 192000, 0x9ec77f97
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0, 67, 67, 1, 192000, 0xc91c2e37
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0, 68, 68, 1, 192000, 0x7b58751d
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0, 69, 69, 1, 192000, 0xb178dfbb
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0, 70, 70, 1, 192000, 0x2a63b5be
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0, 71, 71, 1, 192000, 0x44a407ac
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0, 72, 72, 1, 192000, 0x9a8e17dd
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0, 73, 73, 1, 192000, 0x5546f4c8
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0, 74, 74, 1, 192000, 0xeda94586
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0, 75, 75, 1, 192000, 0x941dfa6b
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0, 76, 76, 1, 192000, 0x9772301d
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0, 77, 77, 1, 192000, 0x8be16b16
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0, 78, 78, 1, 192000, 0x26dd4496
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0, 79, 79, 1, 192000, 0x27823797
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0, 80, 80, 1, 192000, 0xacc914f7
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0, 81, 81, 1, 192000, 0xcbb72c9b
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0, 82, 82, 1, 192000, 0x4bd3391c
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0, 83, 83, 1, 192000, 0x4e6adbfe
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0, 84, 84, 1, 192000, 0x7a791c75
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0, 85, 85, 1, 192000, 0xc4f59c94
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0, 86, 86, 1, 192000, 0xc4f59c94
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0, 87, 87, 1, 192000, 0x984a4a0b
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0, 88, 88, 1, 192000, 0x3353f31f
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0, 89, 89, 1, 192000, 0xa9d4dc5a
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0, 90, 90, 1, 192000, 0xb33425d0
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0, 91, 91, 1, 192000, 0x546d768a
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0, 92, 92, 1, 192000, 0xfefbe5c9
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0, 93, 93, 1, 192000, 0xbd6be61d
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0, 94, 94, 1, 192000, 0xf5792731
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0, 95, 95, 1, 192000, 0xccde0582
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0, 96, 96, 1, 192000, 0x857d58ee
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0, 97, 97, 1, 192000, 0xe914ce48
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0, 98, 98, 1, 192000, 0x1f736298
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0, 99, 99, 1, 192000, 0xec0b4846
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0, 100, 100, 1, 192000, 0xe1422624
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0, 101, 101, 1, 192000, 0x56e2b0e0
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0, 102, 102, 1, 192000, 0xc4190640
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0, 103, 103, 1, 192000, 0x7c461977
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0, 104, 104, 1, 192000, 0x34b1d5e8
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0, 105, 105, 1, 192000, 0xbdc70f7a
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0, 106, 106, 1, 192000, 0xb466cd8d
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0, 107, 107, 1, 192000, 0x0e86a04c
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0, 0, 0, 1, 192000, 0x7324a772
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0, 1, 1, 1, 192000, 0x6b48acfe
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0, 2, 2, 1, 192000, 0xb4028a8c
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0, 3, 3, 1, 192000, 0x4ef9ffd9
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0, 4, 4, 1, 192000, 0xf25fede9
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0, 5, 5, 1, 192000, 0x4a10f856
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0, 6, 6, 1, 192000, 0x9bc62bcd
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0, 7, 7, 1, 192000, 0x3e5e42a8
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0, 8, 8, 1, 192000, 0x68d15693
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0, 9, 9, 1, 192000, 0xe3f04830
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0, 10, 10, 1, 192000, 0x369d2c04
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0, 11, 11, 1, 192000, 0x1ef93f8e
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0, 12, 12, 1, 192000, 0xcfbc6f0d
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0, 13, 13, 1, 192000, 0x391fc3d9
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0, 14, 14, 1, 192000, 0x20304209
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0, 15, 15, 1, 192000, 0x4b2671af
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0, 16, 16, 1, 192000, 0x8ad63fa5
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0, 17, 17, 1, 192000, 0x0581404f
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0, 18, 18, 1, 192000, 0xcad07f30
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0, 19, 19, 1, 192000, 0xc0ed3a88
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0, 20, 20, 1, 192000, 0x99d611ff
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0, 21, 21, 1, 192000, 0xc4da2368
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0, 22, 22, 1, 192000, 0xe5a8bdd6
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0, 23, 23, 1, 192000, 0x809bc357
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0, 24, 24, 1, 192000, 0xb2569657
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0, 25, 25, 1, 192000, 0x356a91e8
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0, 26, 26, 1, 192000, 0x5ab658cb
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0, 27, 27, 1, 192000, 0xed2148a3
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0, 28, 28, 1, 192000, 0x0e0e3aac
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0, 29, 29, 1, 192000, 0x08b89165
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0, 30, 30, 1, 192000, 0x5512caa6
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0, 31, 31, 1, 192000, 0x3b05f950
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0, 32, 32, 1, 192000, 0x6d0c364e
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0, 33, 33, 1, 192000, 0x5318a9eb
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0, 34, 34, 1, 192000, 0xc9810eb6
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0, 35, 35, 1, 192000, 0x910c6a44
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0, 36, 36, 1, 192000, 0x66fc24e2
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0, 37, 37, 1, 192000, 0x442c2922
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0, 38, 38, 1, 192000, 0xca66fb23
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0, 39, 39, 1, 192000, 0x4c22d6a7
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0, 40, 40, 1, 192000, 0x74757934
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0, 41, 41, 1, 192000, 0xddd028a1
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0, 42, 42, 1, 192000, 0x01952f76
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0, 43, 43, 1, 192000, 0xfb5d9451
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0, 44, 44, 1, 192000, 0xcb20a647
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0, 45, 45, 1, 192000, 0x198684c6
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0, 46, 46, 1, 192000, 0x372237a7
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0, 47, 47, 1, 192000, 0x522235ca
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0, 48, 48, 1, 192000, 0x336e7556
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0, 49, 49, 1, 192000, 0xdd6249b9
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0, 50, 50, 1, 192000, 0x0bba632c
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0, 51, 51, 1, 192000, 0xbbdb5795
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0, 52, 52, 1, 192000, 0x61006766
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0, 53, 53, 1, 192000, 0xe10a5622
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0, 54, 54, 1, 192000, 0x7aa8b6b8
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0, 55, 55, 1, 192000, 0x1c0dae44
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0, 56, 56, 1, 192000, 0x65478853
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0, 57, 57, 1, 192000, 0xcc1397ae
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0, 58, 58, 1, 192000, 0x0d441eae
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0, 59, 59, 1, 192000, 0xa28cf189
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0, 60, 60, 1, 192000, 0x240b3217
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0, 61, 61, 1, 192000, 0x64e7997f
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0, 62, 62, 1, 192000, 0x042428bf
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0, 63, 63, 1, 192000, 0x03ecc1cd
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0, 64, 64, 1, 192000, 0xf5d53b7f
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0, 65, 65, 1, 192000, 0xf0d084c2
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0, 66, 66, 1, 192000, 0xa0d980a2
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0, 67, 67, 1, 192000, 0xcb2e2f42
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0, 68, 68, 1, 192000, 0x7d6a7628
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0, 69, 69, 1, 192000, 0xb38ae0c6
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0, 70, 70, 1, 192000, 0x2c75b6c9
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0, 71, 71, 1, 192000, 0x46b608b7
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0, 72, 72, 1, 192000, 0x9ca018e8
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0, 73, 73, 1, 192000, 0x5758f5d3
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0, 74, 74, 1, 192000, 0xefbb4691
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0, 75, 75, 1, 192000, 0x962ffb76
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0, 76, 76, 1, 192000, 0x99843128
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0, 77, 77, 1, 192000, 0x8df36c21
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0, 78, 78, 1, 192000, 0x28ef45a1
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0, 79, 79, 1, 192000, 0x299438a2
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0, 80, 80, 1, 192000, 0xaedb1602
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0, 81, 81, 1, 192000, 0xcdc92da6
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0, 82, 82, 1, 192000, 0x4de53a27
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0, 83, 83, 1, 192000, 0x507cdd09
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0, 84, 84, 1, 192000, 0x7c8b1d80
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0, 85, 85, 1, 192000, 0xc7079d9f
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0, 86, 86, 1, 192000, 0xc7079d9f
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0, 87, 87, 1, 192000, 0x9a5c4b16
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0, 88, 88, 1, 192000, 0x3565f42a
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0, 89, 89, 1, 192000, 0xabe6dd65
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0, 90, 90, 1, 192000, 0xb54626db
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0, 91, 91, 1, 192000, 0x567f7795
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0, 92, 92, 1, 192000, 0x011ce6d4
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0, 93, 93, 1, 192000, 0xbf7de728
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0, 94, 94, 1, 192000, 0xf78b283c
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0, 95, 95, 1, 192000, 0xcef0068d
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0, 96, 96, 1, 192000, 0x878f59f9
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0, 97, 97, 1, 192000, 0xeb26cf53
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0, 98, 98, 1, 192000, 0x218563a3
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0, 99, 99, 1, 192000, 0xee1d4951
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0, 100, 100, 1, 192000, 0xe354272f
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0, 101, 101, 1, 192000, 0x58f4b1eb
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0, 102, 102, 1, 192000, 0xc62b074b
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0, 103, 103, 1, 192000, 0x7e581a82
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0, 104, 104, 1, 192000, 0x36c3d6f3
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0, 105, 105, 1, 192000, 0xbfd91085
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0, 106, 106, 1, 192000, 0xb678ce98
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0, 107, 107, 1, 192000, 0x1098a157
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