ffmpeg | branch: release/4.3 | Michael Niedermayer <mich...@niedermayer.cc> | Wed Dec 11 21:36:11 2024 +0100| [6ad3e87a87cfbbe4a91e28856caa68d99ac9348c] | committer: Michael Niedermayer
avformat/matroskadec: Check pre_ns for overflow Fixes: signed integer overflow: -3483479120376300096 - 7442323944145700864 cannot be represented in type 'long' Fixes: 383187489/clusterfuzz-testcase-minimized-ffmpeg_dem_WEBM_DASH_MANIFEST_fuzzer-4561470580391936 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> (cherry picked from commit 361d24e6d920e4f7e4e5fa1fd6fbb6922bff35f2) Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=6ad3e87a87cfbbe4a91e28856caa68d99ac9348c --- libavformat/matroskadec.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c index a42f8e34d1..73c7b3437a 100644 --- a/libavformat/matroskadec.c +++ b/libavformat/matroskadec.c @@ -4064,9 +4064,10 @@ static int64_t webm_dash_manifest_compute_bandwidth(AVFormatContext *s, int64_t // The prebuffer ends in the last Cue. Estimate how much data was // prebuffered. pre_bytes = desc_end.end_offset - desc_end.start_offset; - pre_ns = desc_end.end_time_ns - desc_end.start_time_ns; - if (pre_ns <= 0) + if (desc_end.end_time_ns <= desc_end.start_time_ns || + desc_end.end_time_ns - (uint64_t)desc_end.start_time_ns > INT64_MAX) return -1; + pre_ns = desc_end.end_time_ns - desc_end.start_time_ns; pre_sec = pre_ns / nano_seconds_per_second; prebuffer_bytes += pre_bytes * ((temp_prebuffer_ns / nano_seconds_per_second) / pre_sec); _______________________________________________ ffmpeg-cvslog mailing list ffmpeg-cvslog@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog To unsubscribe, visit link above, or email ffmpeg-cvslog-requ...@ffmpeg.org with subject "unsubscribe".
