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avcodec/scpr: Check minimum size of type 17 

Improves: Timeout (85sec -> 46sec)
Improves: 17644/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SCPR_fuzzer-5715704283660288

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-09-26 21:56:48 +02:00
parent 080819b3b4
commit b3c25263d1
1 changed files with 3 additions and 0 deletions
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3
libavcodec/scpr.c
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@ -534,6 +534,9 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
uint32_t clr, *dst = (uint32_t *)s->current_frame->data[0]; uint32_t clr, *dst = (uint32_t *)s->current_frame->data[0];
int y; int y;
if (bytestream2_get_bytes_left(gb) < 3)
return AVERROR_INVALIDDATA;
frame->key_frame = 1; frame->key_frame = 1;
bytestream2_skip(gb, 1); bytestream2_skip(gb, 1);
if (avctx->bits_per_coded_sample == 16) { if (avctx->bits_per_coded_sample == 16) {