ffmpeg | branch: release/4.2 | Michael Niedermayer <mich...@niedermayer.cc> | Sat Feb 5 20:37:22 2022 +0100| [fd062924b8df47b8d6af81e0745c52282aee19e1] | committer: Michael Niedermayer
avformat/matroskadec: Check desc_bytes Fixes: Division by 0 Fixes: 44035/clusterfuzz-testcase-minimized-ffmpeg_dem_WEBM_DASH_MANIFEST_fuzzer-4826721386364928 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 5038933977d06d1048b41d71e0ada4d1ac536ddc) Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=fd062924b8df47b8d6af81e0745c52282aee19e1 --- libavformat/matroskadec.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c index 60f2e767a6..1607f94d48 100644 --- a/libavformat/matroskadec.c +++ b/libavformat/matroskadec.c @@ -4071,12 +4071,16 @@ static int64_t webm_dash_manifest_compute_bandwidth(AVFormatContext *s, int64_t do { int64_t desc_bytes = desc_end.end_offset - desc_beg.start_offset; int64_t desc_ns = desc_end.end_time_ns - desc_beg.start_time_ns; - double desc_sec = desc_ns / nano_seconds_per_second; - double calc_bits_per_second = (desc_bytes * 8) / desc_sec; + double desc_sec, calc_bits_per_second, percent, mod_bits_per_second; + if (desc_bytes <= 0) + return -1; + + desc_sec = desc_ns / nano_seconds_per_second; + calc_bits_per_second = (desc_bytes * 8) / desc_sec; // Drop the bps by the percentage of bytes buffered. - double percent = (desc_bytes - prebuffer_bytes) / desc_bytes; - double mod_bits_per_second = calc_bits_per_second * percent; + percent = (desc_bytes - prebuffer_bytes) / desc_bytes; + mod_bits_per_second = calc_bits_per_second * percent; if (prebuffer < desc_sec) { double search_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".
