commit d5824ce1b5491df7d2eb0b66189d366fa67b4585
author Bram Moolenaar <Bram@vim.org> Sun Sep 04 20:35:01 2016 +0200
committer Bram Moolenaar <Bram@vim.org> Sun Sep 04 20:35:01 2016 +0200
tree c714124ce2cbbb424824917b9058da7cdf82cb9c
parent 30180b8dad5c1478e7920e56a71352cb318fadb0

patch 7.4.2326
Problem:    Illegal memory access when Visual selection starts in invalid
            position. (Dominique Pelle)
Solution:   Correct position when needed.

src/normal.c

diff --git a/src/normal.c b/src/normal.c
index 0f9b230..edaa740 100644
--- a/src/normal.c
+++ b/src/normal.c
@@ -9451,7 +9451,10 @@
 #ifdef FEAT_MBYTE
     /* prevent from moving onto a trail byte */
     if (has_mbyte)
+    {
+	check_pos(curwin->w_buffer, &oap->end);
 	mb_adjustpos(curwin->w_buffer, &oap->end);
+    }
 #endif
 
     getvvcol(curwin, &(oap->start), &oap->start_vcol, NULL, &oap->end_vcol);