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avcodec/iff: Check that video_size is large enough for the read parameters 

video is allocated before parameters like bpp are read.

Fixes: out of array access
Fixes: 19084/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_IFF_ILBM_fuzzer-5718556033679360
Fixes: 19465/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_IFF_ILBM_fuzzer-5759908398235648

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 2019-11-30 12:22:25 +01:00
parent fc3760a66d
commit f1b97f62f8
1 changed files with 2 additions and 0 deletions
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2
libavcodec/iff.c
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@ -322,6 +322,8 @@ static int extract_header(AVCodecContext *const avctx,
av_log(avctx, AV_LOG_ERROR, "Invalid number of bitplanes: %u\n", s->bpp);
return AVERROR_INVALIDDATA;
}
if (s->video_size && s->planesize * s->bpp * avctx->height > s->video_size)
return AVERROR_INVALIDDATA;
av_freep(&s->ham_buf);
av_freep(&s->ham_palbuf);