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avcodec/iff: Test video_size being non zero 

Fixes: Out of array access
Fixes: 20659/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_IFF_ILBM_fuzzer-5658548592967680
Fixes: 20659/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_IFF_ILBM_fuzzer-5723561177382912

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 2020-05-11 21:18:58 +02:00
parent 4d701e9222
commit a035fd88ae
1 changed files with 2 additions and 0 deletions
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2
libavcodec/iff.c
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@ -440,6 +440,8 @@ static av_cold int decode_init(AVCodecContext *avctx)
if (avctx->codec_tag == MKTAG('A', 'N', 'I', 'M')) {
s->video_size = FFALIGN(avctx->width, 2) * avctx->height * s->bpp;
if (!s->video_size)
return AVERROR_INVALIDDATA;
s->video[0] = av_calloc(FFALIGN(avctx->width, 2) * avctx->height, s->bpp);
s->video[1] = av_calloc(FFALIGN(avctx->width, 2) * avctx->height, s->bpp);
s->pal = av_calloc(256, sizeof(*s->pal));