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avcodec/zmbv: Check decomp_size

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Fixes: OOM
Fixes: 2710/clusterfuzz-testcase-minimized-4750001420894208

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Tomas Härdin <tjoppen@acc.umu.se>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-08-16 16:03:23 +02:00
parent 28e9ba951d
commit 931c0ac95c
1 changed files with 5 additions and 0 deletions
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5
libavcodec/zmbv.c
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@ -589,6 +589,11 @@ static av_cold int decode_init(AVCodecContext *avctx)
// Needed if zlib unused or init aborted before inflateInit
memset(&c->zstream, 0, sizeof(z_stream));
if ((avctx->width + 255ULL) * (avctx->height + 64ULL) > FFMIN(avctx->max_pixels, INT_MAX / 4) ) {
av_log(avctx, AV_LOG_ERROR, "Internal buffer (decomp_size) larger than max_pixels or too large\n");
return AVERROR_INVALIDDATA;
}
c->decomp_size = (avctx->width + 255) * 4 * (avctx->height + 64);
/* Allocate decompression buffer */