[FFmpeg-cvslog] avformat/mov: Move +1 in check to avoid hypothetical overflow in add_ctts_entry()

[Michael Niedermayer]

ffmpeg | branch: release/3.3 | Michael Niedermayer <michael at niedermayer.cc> | Sat Feb  3 21:36:22 2018 +0100| [8a89cce372884c38c6f22eede59c43f486b83394] | committer: Michael Niedermayer

avformat/mov: Move +1 in check to avoid hypothetical overflow in add_ctts_entry()

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit eb60b9d3aaaa42265fb1960be6fff6383cfdbf37)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=8a89cce372884c38c6f22eede59c43f486b83394
---

 libavformat/mov.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index 6124b0b573..b60f8f0eac 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -2970,7 +2970,7 @@ static int64_t add_ctts_entry(MOVStts** ctts_data, unsigned int* ctts_count, uns
         FFMAX(min_size_needed, 2 * (*allocated_size)) :
         min_size_needed;
 
-    if((unsigned)(*ctts_count) + 1 >= UINT_MAX / sizeof(MOVStts))
+    if((unsigned)(*ctts_count) >= UINT_MAX / sizeof(MOVStts) - 1)
         return -1;
 
     ctts_buf_new = av_fast_realloc(*ctts_data, allocated_size, requested_size);