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-rw-r--r--ui/vnc.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/ui/vnc.c b/ui/vnc.c
index aef6d3af26..deb9ecd681 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -2562,6 +2562,9 @@ static int vnc_refresh_server_surface(VncDisplay *vd)
      * Update server dirty map.
      */
     cmp_bytes = 16 * ds_get_bytes_per_pixel(vd->ds);
+    if (cmp_bytes > vd->ds->surface->linesize) {
+        cmp_bytes = vd->ds->surface->linesize;
+    }
     guest_row  = vd->guest.ds->data;
     server_row = vd->server->data;
     for (y = 0; y < vd->guest.ds->height; y++) {