# HG changeset patch
# User Bram Moolenaar <bram@vim.org>
# Date 1439051026 -7200
# Node ID c0a23e04c929b9eb6cf996d202e5ec51d0120528
# Parent  e86ada5d3fa02a307117ff40a6d1fbd0f27f82ef
patch 7.4.812
Problem:    Gcc sanitizer complains about using a NULL pointer to memmove().
Solution:   Only call memmove when there is something to move. (Vittorio
            Zecca)

diff --git a/src/memline.c b/src/memline.c
--- a/src/memline.c
+++ b/src/memline.c
@@ -3834,7 +3834,8 @@ ml_add_stack(buf)
 					(buf->b_ml.ml_stack_size + STACK_INCR));
 	if (newstack == NULL)
 	    return -1;
-	mch_memmove(newstack, buf->b_ml.ml_stack,
+	if (top > 0)
+	    mch_memmove(newstack, buf->b_ml.ml_stack,
 					     (size_t)top * sizeof(infoptr_T));
 	vim_free(buf->b_ml.ml_stack);
 	buf->b_ml.ml_stack = newstack;
diff --git a/src/version.c b/src/version.c
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    812,
+/**/
     811,
 /**/
     810,