Fixes: signed integer overflow: -9223372036854775808 - 17 cannot be represented in type 'long'
Fixes: 18768/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5674385247830016
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
uint8_t key[256], val[256];
AVIOContext *pb = s->pb;
AVStream *st;
- int64_t pos, offset, temp;
+ int64_t pos, offset=0, temp;
pos = avio_tell(pb);
tag = avio_rl32(pb);
offset = temp;
temp = avio_rb64(pb);
}
+ if (offset <= 0)
+ return AVERROR_INVALIDDATA;
avio_skip(pb, offset - avio_tell(pb));
if (avio_r8(pb) != 1)
return AVERROR_INVALIDDATA;