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avcodec/pngdsp: fix (un)signed type in end comparission 

Fixes out of array accesses
Fixes Ticket2919

Found_by: ami_stuff
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-08-30 23:14:32 +02:00
parent 0b46d6f3ef
commit 86736f59d6
1 changed files with 1 additions and 1 deletions
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2
libavcodec/pngdsp.c
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@ -31,7 +31,7 @@
static void add_bytes_l2_c(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w) static void add_bytes_l2_c(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w)
{ {
long i; 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 *)(src1 + i); long a = *(long *)(src1 + i);
long b = *(long *)(src2 + i); long b = *(long *)(src2 + i);
*(long *)(dst + i) = ((a & pb_7f) + (b & pb_7f)) ^ ((a ^ b) & pb_80); *(long *)(dst + i) = ((a & pb_7f) + (b & pb_7f)) ^ ((a ^ b) & pb_80);