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avformat/mxfdec: Fix file position addition

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Fixes: signed integer overflow: 9223372036854775805 + 4 cannot be represented in type 'long'
Fixes: 29927/clusterfuzz-testcase-minimized-ffmpeg_dem_MXF_fuzzer-5579985228267520

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 2021-02-01 19:59:55 +01:00
parent f8ec1da8ac
commit f7c3484b26
1 changed files with 1 additions and 1 deletions
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libavformat/mxfdec.c
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@ -2903,7 +2903,7 @@ static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadF
meta = NULL;
ctx = mxf;
}
while (avio_tell(pb) + 4 < klv_end && !avio_feof(pb)) {
while (avio_tell(pb) + 4ULL < klv_end && !avio_feof(pb)) {
int ret;
int tag = avio_rb16(pb);
int size = avio_rb16(pb); /* KLV specified by 0x53 */