[FFmpeg-cvslog] avformat/rpl: The associative law doesnt hold for signed integers in C

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Thu Jun 10 20:35:43 2021 +0200| [480f11bdd713c15e4964093be7ef0adf5b619cc1] | committer: Michael Niedermayer

avformat/rpl: The associative law doesnt hold for signed integers in C

Add () to avoid undefined behavior
Fixes: signed integer overflow: 9223372036854775790 + 57 cannot be represented in type 'long'
Fixes: 34983/clusterfuzz-testcase-minimized-ffmpeg_dem_RPL_fuzzer-5765822923538432

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=480f11bdd713c15e4964093be7ef0adf5b619cc1
---

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

diff --git a/libavformat/rpl.c b/libavformat/rpl.c
index fac377b68e..296cb2c984 100644
--- a/libavformat/rpl.c
+++ b/libavformat/rpl.c
@@ -103,7 +103,7 @@ static AVRational read_fps(const char* line, int* error)
         // Truncate any numerator too large to fit into an int64_t
         if (num > (INT64_MAX - 9) / 10 || den > INT64_MAX / 10)
             break;
-        num  = 10 * num + *line - '0';
+        num  = 10 * num + (*line - '0');
         den *= 10;
     }
     if (!num)