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avcodec/gif: fix off by one in column offsetting finding

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(cherry picked from commit f9240ec01a)
This commit is contained in:
Clément Bœsch
2015-02-16 17:23:34 +01:00
parent 3429714f3d
commit e5cc73e0a5
3 changed files with 12 additions and 12 deletions
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4
libavcodec/gif.c
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@@ -105,7 +105,7 @@ static int gif_image_write_image(AVCodecContext *avctx,
/* skip common columns */
while (x_start < x_end) {
int same_column = 1;
for (y = y_start; y < y_end; y++) {
for (y = y_start; y <= y_end; y++) {
if (ref[y*ref_linesize + x_start] != buf[y*linesize + x_start]) {
same_column = 0;
break;
@@ -117,7 +117,7 @@ static int gif_image_write_image(AVCodecContext *avctx,
}
while (x_end > x_start) {
int same_column = 1;
for (y = y_start; y < y_end; y++) {
for (y = y_start; y <= y_end; y++) {
if (ref[y*ref_linesize + x_end] != buf[y*linesize + x_end]) {
same_column = 0;
break;