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avformat/mxfdec: Check edit unit for overflow in mxf_set_current_edit_unit()

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Fixes: signed integer overflow: 9223372036854775807 + 1 cannot be represented in type 'long'
Fixes: 392672068/clusterfuzz-testcase-minimized-ffmpeg_dem_MXF_fuzzer-6232335892152320

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Tomas Härdin <git@haerdin.se>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 8a6ad9eab2)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2025-02-05 03:47:52 +01:00
parent 9d5b967325
commit 2ad73fc12c
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1 changed files with 1 additions and 1 deletions
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libavformat/mxfdec.c
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@ -3390,7 +3390,7 @@ static int64_t mxf_set_current_edit_unit(MXFContext *mxf, AVStream *st, int64_t
int64_t new_edit_unit;
MXFIndexTable *t = mxf_find_index_table(mxf, track->index_sid);
if (!t || track->wrapping == UnknownWrapped)
if (!t || track->wrapping == UnknownWrapped || edit_unit > INT64_MAX - track->edit_units_per_packet)
return -1;
if (mxf_edit_unit_absolute_offset(mxf, t, edit_unit + track->edit_units_per_packet, track->edit_rate, NULL, &next_ofs, NULL, 0) < 0 &&