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| author | Michael Niedermayer <michael@niedermayer.cc> | 2020-04-07 19:29:44 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2020-05-19 17:17:36 +0200 |
| commit | 7ab1351794263093bf05704796513cc9e731a433 (patch) | |
| tree | 5b2f367096fdeb8a52ebb57099b85c556c259f30 | |
| parent | 65ae8c5a310b2717c7497675761151de87c9836e (diff) | |
| download | ffmpeg-7ab1351794263093bf05704796513cc9e731a433.tar.gz | |
avcodec/pngdec: Check length in fdAT
Fixes: 21089/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APNG_fuzzer-5135981419429888
Fixes: out of array read
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 79e5c2ee2bbdf462cabd2113c723dfb613d735c2)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/pngdec.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c index 9634858e1f..cc2795e5c5 100644 --- a/libavcodec/pngdec.c +++ b/libavcodec/pngdec.c @@ -1242,7 +1242,7 @@ static int decode_frame_common(AVCodecContext *avctx, PNGDecContext *s, case MKTAG('f', 'd', 'A', 'T'): if (!CONFIG_APNG_DECODER || avctx->codec_id != AV_CODEC_ID_APNG) goto skip_tag; - if (!decode_next_dat) { + if (!decode_next_dat || length < 4) { ret = AVERROR_INVALIDDATA; goto fail; } |