[FFmpeg-cvslog] avutil/parseutils: Check sign in av_parse_time()

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Thu Jan 14 21:11:05 2021 +0100| [5d7f17e885ef3a7aae2035bed54604938d83e98d] | committer: Michael Niedermayer

avutil/parseutils: Check sign in av_parse_time()

Fixes: signed integer overflow: -9223372053736 * 1000000 cannot be represented in type 'long'
Fixes: 26910/clusterfuzz-testcase-minimized-ffmpeg_dem_CONCAT_fuzzer-6607924558430208

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=5d7f17e885ef3a7aae2035bed54604938d83e98d
---

 libavutil/parseutils.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libavutil/parseutils.c b/libavutil/parseutils.c
index 167e822648..7f678cd85a 100644
--- a/libavutil/parseutils.c
+++ b/libavutil/parseutils.c
@@ -736,12 +736,14 @@ int av_parse_time(int64_t *timeval, const char *timestr, int duration)
     if (*q)
         return AVERROR(EINVAL);
 
-    if (INT64_MAX / suffix < t)
+    if (INT64_MAX / suffix < t || t < INT64_MIN / suffix)
         return AVERROR(ERANGE);
     t *= suffix;
     if (INT64_MAX - microseconds < t)
         return AVERROR(ERANGE);
     t += microseconds;
+    if (t == INT64_MIN && negative)
+        return AVERROR(ERANGE);
     *timeval = negative ? -t : t;
     return 0;
 }