[FFmpeg-cvslog] swscale/utils: Allocate more dithererror

[Michael Niedermayer]

ffmpeg | branch: release/6.0 | Michael Niedermayer <michael at niedermayer.cc> | Sat Feb 17 01:04:13 2024 +0100| [a18520cce8b9a4654e56d7a82f035f7717419607] | committer: Michael Niedermayer

swscale/utils: Allocate more dithererror

Fixes: out of array read
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 18f26f8a2f8dc3b9ec3ac3ab8e03fce15cc8c88d)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a18520cce8b9a4654e56d7a82f035f7717419607
---

 libswscale/utils.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libswscale/utils.c b/libswscale/utils.c
index 925c536bf1..07c76a2c22 100644
--- a/libswscale/utils.c
+++ b/libswscale/utils.c
@@ -1880,7 +1880,7 @@ static av_cold int sws_init_single_context(SwsContext *c, SwsFilter *srcFilter,
     }
 
     for (i = 0; i < 4; i++)
-        if (!FF_ALLOCZ_TYPED_ARRAY(c->dither_error[i], c->dstW + 2))
+        if (!FF_ALLOCZ_TYPED_ARRAY(c->dither_error[i], c->dstW + 3))
             goto nomem;
 
     c->needAlpha = (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat)) ? 1 : 0;