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avcodec/pngdec: Check for fctl after idat

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Fixes: out of array access
Fixes: 23554/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APNG_fuzzer-4796622520451072.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 65b1ba680fb67902a9c876a49d0146eaae5a1c3d)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-06-25 19:22:01 +02:00
parent 7dc5dfad31
commit c095e870d8
1 changed files with 5 additions and 0 deletions
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5
libavcodec/pngdec.c
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@ -973,6 +973,11 @@ static int decode_fctl_chunk(AVCodecContext *avctx, PNGDecContext *s,
return AVERROR_INVALIDDATA;
}
if (s->pic_state & PNG_IDAT) {
av_log(avctx, AV_LOG_ERROR, "fctl after IDAT\n");
return AVERROR_INVALIDDATA;
}
s->last_w = s->cur_w;
s->last_h = s->cur_h;
s->last_x_offset = s->x_offset;