resample2: fix potential overflow

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

1 files changed, 2 insertions, 3 deletions

diff --git a/libswresample/resample2.c b/libswresample/resample2.c
index 5a2082478b..02f29bacf1 100644
--- a/libswresample/resample2.c
+++ b/libswresample/resample2.c
@@ -269,10 +269,9 @@ int swr_resample(AVResampleContext *c, short *dst, const short *src, int *consum
             dst[dst_index] = src[index2>>32];
             index2 += incr;
         }
-        frac += dst_index * dst_incr_frac;
         index += dst_index * dst_incr;
-        index += frac / c->src_incr;
-        frac %= c->src_incr;
+        index += (frac + dst_index * (int64_t)dst_incr_frac) / c->src_incr;
+        frac   = (frac + dst_index * (int64_t)dst_incr_frac) % c->src_incr;
     }else{
         for(dst_index=0; dst_index < dst_size; dst_index++){
             FELEM *filter= c->filter_bank + c->filter_length*(index & c->phase_mask);