dsputil/pngdsp: fix signed/unsigned type in end comparison

Fixes out of array accesses and integer overflows.

1 files changed, 2 insertions, 2 deletions

diff --git a/libavcodec/dsputil.c b/libavcodec/dsputil.c
index fbdd5adbb1..e734fcd223 100644
--- a/libavcodec/dsputil.c
+++ b/libavcodec/dsputil.c
@@ -1742,7 +1742,7 @@ void ff_set_cmp(DSPContext* c, me_cmp_func *cmp, int type){
 
 static void add_bytes_c(uint8_t *dst, uint8_t *src, int w){
     long i;
-    for(i=0; i<=w-sizeof(long); i+=sizeof(long)){
+    for (i = 0; i <= w - (int) sizeof(long); i += sizeof(long)) {
         long a = *(long*)(src+i);
         long b = *(long*)(dst+i);
         *(long*)(dst+i) = ((a&pb_7f) + (b&pb_7f)) ^ ((a^b)&pb_80);
@@ -1767,7 +1767,7 @@ static void diff_bytes_c(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w){
         }
     }else
 #endif
-    for(i=0; i<=w-sizeof(long); i+=sizeof(long)){
+    for (i = 0; i <= w - (int) sizeof(long); i += sizeof(long)) {
         long a = *(long*)(src1+i);
         long b = *(long*)(src2+i);
         *(long*)(dst+i) = ((a|pb_80) - (b&pb_7f)) ^ ((a^b^pb_80)&pb_80);