ffmpeg | branch: master | Michael Niedermayer <michael@niedermayer.cc> | Sat Jan 16 21:48:57 2021 +0100| [463e024363d0ba0254c1f08b348bef02f148bb6a] | committer: Michael Niedermayer avformat/mpsubdec: Use av_sat_add/sub64() in fracval handling Fixes: signed integer overflow: 9223372036850000000 + 9000000 cannot be represented in type 'long long' Fixes: 26910/clusterfuzz-testcase-minimized-ffmpeg_dem_MPSUB_fuzzer-665448017480908 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=463e024363d0ba0254...

libavformat/mpsubdec.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/libavformat/mpsubdec.c b/libavformat/mpsubdec.c index e7b83a1d85..2e6dc883eb 100644 --- a/libavformat/mpsubdec.c +++ b/libavformat/mpsubdec.c @@ -72,8 +72,8 @@ static int parse_line(const char *line, int64_t *value, int64_t *value2) fracval *= 10; for (;p2 - p1 > 7 + 1; p1++) fracval /= 10; - if (intval > 0) intval += fracval; - else intval -= fracval; + if (intval > 0) intval = av_sat_add64(intval, fracval); + else intval = av_sat_sub64(intval, fracval); line += p2; } else line += p1;