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avcodec/h264_cavlc: Check mb_skip_run 

Fixes: 10300/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_H264_fuzzer-6292205497483264
Fixes: signed integer overflow: -2147483648 - 1 cannot be represented in type 'int'

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 2018-10-04 03:13:41 +02:00
parent d7dbad12f8
commit f72b9904fe
1 changed files with 8 additions and 2 deletions
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10
libavcodec/h264_cavlc.c
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@ -714,8 +714,14 @@ int ff_h264_decode_mb_cavlc(const H264Context *h, H264SliceContext *sl)
cbp = 0; /* avoid warning. FIXME: find a solution without slowing
down the code */
if (sl->slice_type_nos != AV_PICTURE_TYPE_I) {
if (sl->mb_skip_run == -1)
sl->mb_skip_run = get_ue_golomb_long(&sl->gb);
if (sl->mb_skip_run == -1) {
unsigned mb_skip_run = get_ue_golomb_long(&sl->gb);
if (mb_skip_run > h->mb_num) {
av_log(h->avctx, AV_LOG_ERROR, "mb_skip_run %d is invalid\n", mb_skip_run);
return AVERROR_INVALIDDATA;
}
sl->mb_skip_run = mb_skip_run;
}
if (sl->mb_skip_run--) {
if (FRAME_MBAFF(h) && (sl->mb_y & 1) == 0) {