resample: Fix overflow

Found-by: Jim Radford
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 6ae93d030476ddd7fa2ab4d9d2dd25df85725390)

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

1 files changed, 4 insertions, 2 deletions

diff --git a/libavcodec/resample2.c b/libavcodec/resample2.c
index ac9db73c8c..01478190a3 100644
--- a/libavcodec/resample2.c
+++ b/libavcodec/resample2.c
@@ -190,8 +190,10 @@ AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_size,
     memcpy(&c->filter_bank[c->filter_length*phase_count+1], c->filter_bank, (c->filter_length-1)*sizeof(FELEM));
     c->filter_bank[c->filter_length*phase_count]= c->filter_bank[c->filter_length - 1];
 
-    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))
+        return NULL;
+    c->ideal_dst_incr= c->dst_incr;
+
     c->index= -phase_count*((c->filter_length-1)/2);
 
     return c;