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avformat/mxfdec: Reorder elements of expression in bisect loop 

Fixes: signed integer overflow: 9223372036854775807 - -1 cannot be represented in type 'long'
Fixes: 68578/clusterfuzz-testcase-minimized-ffmpeg_dem_MXF_fuzzer-6032171648221184

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 d8d288479d)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2024-07-16 21:31:21 +02:00
parent b230ab8287
commit 4e68dd522e
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1 changed files with 1 additions and 2 deletions
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libavformat/mxfdec.c
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@ -3312,8 +3312,7 @@ static int mxf_get_next_track_edit_unit(MXFContext *mxf, MXFTrack *track, int64_
a = -1; a = -1;
b = track->original_duration; b = track->original_duration;
while (b - 1 > a) {
while (b - a > 1) {
m = (a + b) >> 1; m = (a + b) >> 1;
if (mxf_edit_unit_absolute_offset(mxf, t, m, track->edit_rate, NULL, &offset, NULL, 0) < 0) if (mxf_edit_unit_absolute_offset(mxf, t, m, track->edit_rate, NULL, &offset, NULL, 0) < 0)
return -1; return -1;