linux-kernel - [PATCH] strncpy() will not \0 terminate result

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Date:	Thu, 13 Jan 2011 23:35:39 +0100 (CET)
From:	Jesper Juhl <jj@...osbits.net>
To:	Tony Finch <dot@...at.at>
cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] strncpy() will not \0 terminate result

Hi,

Mpass() in scripts/unifdef.c has this code:
  strncpy(keyword, "if  ", 4);
this will fail to \0 terminate the destination.
Following patch should fix that up.

Signed-off-by: Jesper Juhl <jj@...osbits.net>
---
 unifdef.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/unifdef.c b/scripts/unifdef.c
index 44d3978..d579249 100644
--- a/scripts/unifdef.c
+++ b/scripts/unifdef.c
@@ -376,7 +376,7 @@ static void Idrop (void) { Fdrop();  ignoreon(); }
 static void Itrue (void) { Ftrue();  ignoreon(); }
 static void Ifalse(void) { Ffalse(); ignoreon(); }
 /* edit this line */
-static void Mpass (void) { strncpy(keyword, "if  ", 4); Pelif(); }
+static void Mpass (void) { strncpy(keyword, "if  ", 5); Pelif(); }
 static void Mtrue (void) { keywordedit("else\n");  state(IS_TRUE_MIDDLE); }
 static void Melif (void) { keywordedit("endif\n"); state(IS_FALSE_TRAILER); }
 static void Melse (void) { keywordedit("endif\n"); state(IS_FALSE_ELSE); }

-- 
Jesper Juhl <jj@...osbits.net>            http://www.chaosbits.net/
Don't top-post http://www.catb.org/~esr/jargon/html/T/top-post.html
Plain text mails only, please.

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