resample: Fix overflow

Found-by: Jim Radford
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 4 insertions, 2 deletions

diff --git a/libswresample/resample2.c b/libswresample/resample2.c
index 6af2b6c661..5a2082478b 100644
--- a/libswresample/resample2.c
+++ b/libswresample/resample2.c
@@ -224,8 +224,10 @@ AVResampleContext *swr_resample_init(AVResampleContext *c, int out_rate, int in_
     }
 
     c->compensation_distance= 0;
-    c->src_incr= out_rate;
-    c->ideal_dst_incr= c->dst_incr= in_rate * phase_count;
+    if(!av_reduce(&c->src_incr, &c->dst_incr, out_rate, in_rate * (int64_t)phase_count, INT32_MAX/2))
+        goto error;
+    c->ideal_dst_incr= c->dst_incr;
+
     c->index= -phase_count*((c->filter_length-1)/2);
     c->frac= 0;