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avcodec/vb: Check for end of bytestream before reading blocktype

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Fixes: Timeout
Fixes: 9601/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VB_fuzzer-4550228702134272

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 1cbac9ce20)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-08-20 22:19:23 +02:00
parent 22f743e602
commit c2ac8d3147
1 changed files with 4 additions and 0 deletions
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4
libavcodec/vb.c
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@ -107,6 +107,10 @@ static int vb_decode_framedata(VBDecContext *c, int offset)
blk2 = 0;
for (blk = 0; blk < blocks; blk++) {
if (!(blk & 3)) {
if (bytestream2_get_bytes_left(&g) < 1) {
av_log(c->avctx, AV_LOG_ERROR, "Insufficient data\n");
return AVERROR_INVALIDDATA;
}
blocktypes = bytestream2_get_byte(&g);
}
switch (blocktypes & 0xC0) {