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avcodec/v210dec: move the stride read after its fully initialized 

Fixes: out of array read
Fixes: 19129/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_V210_fuzzer-5068171023482880
Maybe fixes: 19130/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_V210_fuzzer-5637264407527424

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Limin Wang <lance.lmwang@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-12-01 23:26:47 +01:00
parent 7aef2f59b5
commit ab3044368f
1 changed files with 1 additions and 1 deletions
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2
libavcodec/v210dec.c
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@ -153,7 +153,6 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
int aligned_width = ((avctx->width + 47) / 48) * 48;
stride = aligned_width * 8 / 3;
}
td.stride = stride;
if (avpkt->size < stride * avctx->height) {
if ((((avctx->width + 23) / 24) * 24 * 8) / 3 * avctx->height == avpkt->size) {
@ -166,6 +165,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
return AVERROR_INVALIDDATA;
}
}
td.stride = stride;
if ( avctx->codec_tag == MKTAG('C', '2', '1', '0')
&& avpkt->size > 64
&& AV_RN32(psrc) == AV_RN32("INFO")