avfilter/vf_lagfun: fix heap-buffer overflow

Fixes #8310

diff --git a/libavfilter/vf_lagfun.c b/libavfilter/vf_lagfun.c
index 329c7465e14ea2ee165b66219e722a64571635be..1fbc889e35fce95b27fe2bb4de693612c57c8794 100644 (file)
--- a/libavfilter/vf_lagfun.c
+++ b/libavfilter/vf_lagfun.c
@@ -137,7 +137,7 @@ static int lagfun_frame16(AVFilterContext *ctx, void *arg, int jobnr, int nb_job
         }
 
         for (int y = slice_start; y < slice_end; y++) {
-            for (int x = 0; x < s->linesize[p]; x++)
+            for (int x = 0; x < s->linesize[p] / 2; x++)
                 dst[x] = FFMAX(src[x], osrc[x] * decay);
 
             src += in->linesize[p] / 2;