avutil/mathematics: Fix division by 0

Fixes: CID1341571
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

diff --git a/libavutil/mathematics.c b/libavutil/mathematics.c
index c12c73e6e6552675968ef930098b27d60e8b03f0..20ff37f5e9d7667758812332e1c7ec02c66835fc 100644 (file)
--- a/libavutil/mathematics.c
+++ b/libavutil/mathematics.c
@@ -85,7 +85,7 @@ int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd)
         else {
             int64_t ad = a / c;
             int64_t a2 = (a % c * b + r) / c;
-            if (ad >= INT32_MAX && ad > (INT64_MAX - a2) / b)
+            if (ad >= INT32_MAX && b && ad > (INT64_MAX - a2) / b)
                 return INT64_MIN;
             return ad * b + a2;
         }