linux-kernel - [PATCH] fat: Read buffer overflow

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Message-ID: <4A7CAF28.8020908@gmail.com>
Date:	Sat, 08 Aug 2009 00:48:08 +0200
From:	Roel Kluin <roel.kluin@...il.com>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] fat: Read buffer overflow

If len is less or equal to 0, this results in a read of s[-1].

Signed-off-by: Roel Kluin <roel.kluin@...il.com>
---
diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c
index 6f27853..114ff6d 100644
--- a/fs/fat/namei_vfat.c
+++ b/fs/fat/namei_vfat.c
@@ -202,6 +202,9 @@ static inline int vfat_is_used_badchars(const wchar_t *s, int len)
 {
 	int i;
 
+	if (len <= 0)
+		return -EINVAL;
+
 	for (i = 0; i < len; i++)
 		if (vfat_bad_char(s[i]))
 			return -EINVAL;
--
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