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avcodec/cscd: Check output len in zlib as in lzo

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Fixes: Timeout (>10sec -> 134ms)
Fixes: 27245/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_CSCD_fuzzer-575318210772992

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 2020-11-11 23:17:50 +01:00
parent 869fe41d10
commit 6de039823c
1 changed files with 1 additions and 1 deletions
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libavcodec/cscd.c
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@ -93,7 +93,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
case 1: { // zlib compression case 1: { // zlib compression
#if CONFIG_ZLIB #if CONFIG_ZLIB
unsigned long dlen = c->decomp_size; unsigned long dlen = c->decomp_size;
if (uncompress(c->decomp_buf, &dlen, &buf[2], buf_size - 2) != Z_OK) { if (uncompress(c->decomp_buf, &dlen, &buf[2], buf_size - 2) != Z_OK || dlen != c->decomp_size) {
av_log(avctx, AV_LOG_ERROR, "error during zlib decompression\n"); av_log(avctx, AV_LOG_ERROR, "error during zlib decompression\n");
return AVERROR_INVALIDDATA; return AVERROR_INVALIDDATA;
} }