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avcodec/dfa: Check the chunk header is not truncated 

Fixes: Timeout (11sec -> 3sec)
Fixes: 13218/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DFA_fuzzer-5661074316066816

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 2019-03-10 23:45:19 +01:00
parent 41f93f9411
commit f20760fadb
1 changed files with 2 additions and 0 deletions
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2
libavcodec/dfa.c
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@ -355,6 +355,8 @@ static int dfa_decode_frame(AVCodecContext *avctx,
bytestream2_init(&gb, avpkt->data, avpkt->size);
while (bytestream2_get_bytes_left(&gb) > 0) {
if (bytestream2_get_bytes_left(&gb) < 12)
return AVERROR_INVALIDDATA;
bytestream2_skip(&gb, 4);
chunk_size = bytestream2_get_le32(&gb);
chunk_type = bytestream2_get_le32(&gb);