[PATCH 1/1] cmd: Fix out-of-bound access when handling tilde modifiers.

[Yuxuan Shui]

From: Yuxuan Shui

wcschr(str, 0) returns the end of the string, not NULL.
---
 programs/cmd/batch.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/programs/cmd/batch.c b/programs/cmd/batch.c
index 28ecf917ed3..c5a0763c81f 100644
--- a/programs/cmd/batch.c
+++ b/programs/cmd/batch.c
@@ -387,7 +387,7 @@ void WCMD_HandleTildeModifiers(WCHAR **start, BOOL atExecute)
   BOOL  doneModifier    = FALSE;

/* Search forwards until find invalid character modifier */
-  for (; wcschr(validmodifiers, towlower(*lastModifier)); lastModifier = pos++) {
+  for (; *lastModifier && wcschr(validmodifiers, towlower(*lastModifier)); lastModifier = pos++) {
     /* Special case '$' to skip until : found */
     if (*lastModifier == L'$') {
       if (!(pos = wcschr(pos, L':'))) return; /* Invalid syntax */