[FFmpeg-cvslog] avutil/timecode: Fix fps check

[Michael Niedermayer]

ffmpeg | branch: release/2.8 | Michael Niedermayer <michael at niedermayer.cc> | Thu Dec  3 03:14:11 2015 +0100| [f2258e98991c392a23ad089fcbff76f972699103] | committer: Michael Niedermayer

avutil/timecode: Fix fps check

The fps variable is explicitly set to -1 in case of some errors, the check must
thus be signed or the code setting it needs to use 0 as error code
the type of the field could be changed as well but its in an installed header

Fixes: integer overflow
Fixes: 9982cc157b1ea90429435640a989122f/asan_generic_3ad004a_3799_22cf198d9cd09928e2d9ad250474fa58.mov

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit b46dcd5209a77254345ae098b83a872634c5591b)

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f2258e98991c392a23ad089fcbff76f972699103
---

 libavutil/timecode.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavutil/timecode.c b/libavutil/timecode.c
index 1dfd040..bf463ed 100644
--- a/libavutil/timecode.c
+++ b/libavutil/timecode.c
@@ -151,7 +151,7 @@ static int check_fps(int fps)
 
 static int check_timecode(void *log_ctx, AVTimecode *tc)
 {
-    if (tc->fps <= 0) {
+    if ((int)tc->fps <= 0) {
         av_log(log_ctx, AV_LOG_ERROR, "Timecode frame rate must be specified\n");
         return AVERROR(EINVAL);
     }