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avcodec/loco: Limit lossy parameter so it is sane and does not overflow 

Fixes: 15248/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_LOCO_fuzzer-5087440458481664
Fixes: signed integer overflow: 3 + 2147483647 cannot be represented in type 'int'

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-06-15 21:47:16 +02:00
parent 696312c487
commit ce3b0b9066
1 changed files with 5 additions and 0 deletions
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5
libavcodec/loco.c
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@ -295,6 +295,11 @@ static av_cold int decode_init(AVCodecContext *avctx)
avpriv_request_sample(avctx, "LOCO codec version %i", version); avpriv_request_sample(avctx, "LOCO codec version %i", version);
} }
if (l->lossy > 65536U) {
av_log(avctx, AV_LOG_ERROR, "lossy %i is too large\n", l->lossy);
return AVERROR_INVALIDDATA;
}
l->mode = AV_RL32(avctx->extradata + 4); l->mode = AV_RL32(avctx->extradata + 4);
switch (l->mode) { switch (l->mode) {
case LOCO_CYUY2: case LOCO_CYUY2: