linux-kernel - [07/25] hfs: add sanity check for file name length

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Message-Id: <20111123002207.657401939@clark.kroah.org>
Date:	Tue, 22 Nov 2011 16:20:57 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Dan Carpenter <dan.carpenter@...cle.com>
Subject: [07/25] hfs: add sanity check for file name length

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

------------------
Content-Length: 749
Lines: 28

From: Dan Carpenter <dan.carpenter@...cle.com>

commit bc5b8a9003132ae44559edd63a1623b7b99dfb68 upstream.

On a corrupted file system the ->len field could be wrong leading to
a buffer overflow.

Reported-and-acked-by: Clement LECIGNE <clement.lecigne@...asq.com>
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 fs/hfs/trans.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/hfs/trans.c
+++ b/fs/hfs/trans.c
@@ -40,6 +40,8 @@ int hfs_mac2asc(struct super_block *sb,
 
 	src = in->name;
 	srclen = in->len;
+	if (srclen > HFS_NAMELEN)
+		srclen = HFS_NAMELEN;
 	dst = out;
 	dstlen = HFS_MAX_NAMELEN;
 	if (nls_io) {


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