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avcodec/vc1dec: Require res_sprite for wmv3images 

non res_sprite leads to decoder delay which leads to assertion failure
Fixes: Assertion failure
Fixes: 16402/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMV3IMAGE_fuzzer-5704510034411520
Fixes: left shift of 1073741824 by 1 places cannot be represented in type 'int'
Fixes: 16425/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMV3IMAGE_fuzzer-5692858838810624

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 2019-08-15 20:04:35 +02:00
parent 6962fd586e
commit 9c6b400492
1 changed files with 5 additions and 0 deletions
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5
libavcodec/vc1dec.c
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@ -450,6 +450,11 @@ static av_cold int vc1_decode_init(AVCodecContext *avctx)
if ((ret = ff_vc1_decode_sequence_header(avctx, v, &gb)) < 0)
return ret;
if (avctx->codec_id == AV_CODEC_ID_WMV3IMAGE && !v->res_sprite) {
avpriv_request_sample(avctx, "Non sprite WMV3IMAGE");
return AVERROR_PATCHWELCOME;
}
count = avctx->extradata_size*8 - get_bits_count(&gb);
if (count > 0) {
av_log(avctx, AV_LOG_INFO, "Extra data: %i bits left, value: %X\n",