Fix a potential dereferencing of a NULL pointer

1 files changed, 4 insertions, 1 deletions

diff --git a/smenu.c b/smenu.c
index 7d1afd9..261ae97 100644
--- a/smenu.c
+++ b/smenu.c
@@ -5001,12 +5001,15 @@ select_ending_matches(win_t         *win,
       ptr = str + strlen(str);
 
       nb = 0;
-      while ((ptr = utf8_prev(str, ptr)) && isblank(*ptr))
+      while ((ptr = utf8_prev(str, ptr)) != NULL && isblank(*ptr))
         if (ptr - str > 0)
           nb++;
         else
           break;
 
+      if (ptr == NULL) /* str is blank or contain an invalid uft8 sequence. */
+        ptr = str;
+
       /* NOTE: utf8_prev cannot return NULL in the previous loop */
       /* because str always contains at least one UTF-8 valid    */
       /* sequence, so does ptr.                                  */