[PATCH] cmd: avoid potential buffer overflow (Coverity)

[Marcus Meissner]

713256 Out-of-bounds access

We do not have MAX_PATH characters left in "q", at least a \n is already
in the buffer, if not more. Calculate remaining size.

Signed-off-by: Marcus Meissner <marcus at jet.franken.de>
---
 programs/cmd/wcmdmain.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/programs/cmd/wcmdmain.c b/programs/cmd/wcmdmain.c
index 435c7d5..0b2e819 100644
--- a/programs/cmd/wcmdmain.c
+++ b/programs/cmd/wcmdmain.c
@@ -375,7 +375,7 @@ static void WCMD_show_prompt (void) {
 	  *q++ = '(';
 	  break;
 	case 'D':
-	  GetDateFormatW(LOCALE_USER_DEFAULT, DATE_SHORTDATE, NULL, NULL, q, MAX_PATH);
+	  GetDateFormatW(LOCALE_USER_DEFAULT, DATE_SHORTDATE, NULL, NULL, q, MAX_PATH - (q - out_string));
 	  while (*q) q++;
 	  break;
 	case 'E':
-- 
2.8.4