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| author | Michael Niedermayer <michael@niedermayer.cc> | 2020-09-27 20:23:10 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2021-09-10 16:04:26 +0200 |
| commit | b77c294c9acc90cd26650ccdbaaf08db40c7d36a (patch) | |
| tree | c839e9bcfaac1d67aae2c736d916e22f74146d6c | |
| parent | 317b5bdcf2170b1124529ff8f6253ec95b3dfc80 (diff) | |
| download | ffmpeg-b77c294c9acc90cd26650ccdbaaf08db40c7d36a.tar.gz | |
avcodec/cook: Check subpacket index against max
Fixes: off by 1 error
Fixes: index 5 out of bounds for type 'COOKSubpacket [5]'
Fixes: 25772/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_COOK_fuzzer-5762459498184704.fuzz
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 5a2a7604da5f7a2fc498d1d5c90bd892edac9ce8)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/cook.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/libavcodec/cook.c b/libavcodec/cook.c index f7b2461a2b..451eef9609 100644 --- a/libavcodec/cook.c +++ b/libavcodec/cook.c @@ -1084,6 +1084,10 @@ static av_cold int cook_decode_init(AVCodecContext *avctx) ff_audiodsp_init(&q->adsp); while (bytestream2_get_bytes_left(&gb)) { + if (s >= FFMIN(MAX_SUBPACKETS, avctx->block_align)) { + avpriv_request_sample(avctx, "subpackets > %d", FFMIN(MAX_SUBPACKETS, avctx->block_align)); + return AVERROR_PATCHWELCOME; + } /* 8 for mono, 16 for stereo, ? for multichannel Swap to right endianness so we don't need to care later on. */ q->subpacket[s].cookversion = bytestream2_get_be32(&gb); @@ -1215,10 +1219,6 @@ static av_cold int cook_decode_init(AVCodecContext *avctx) q->num_subpackets++; s++; - if (s > FFMIN(MAX_SUBPACKETS, avctx->block_align)) { - avpriv_request_sample(avctx, "subpackets > %d", FFMIN(MAX_SUBPACKETS, avctx->block_align)); - return AVERROR_PATCHWELCOME; - } } /* Try to catch some obviously faulty streams, otherwise it might be exploitable */ |