linux-kernel - [05/35] [CIFS] possible memory corruption on mount

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Date:	Fri, 26 Aug 2011 14:49:22 -0700
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,
	"J.R. Okajima" <hooanon05@...oo.co.jp>,
	Steve French <sfrench@...ibm.com>
Subject: [05/35] [CIFS] possible memory corruption on mount

3.0-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Steve French <sfrench@...ibm.com>

commit 13589c437daf4c8e429b3236c0b923de1c9420d8 upstream.

CIFS cleanup_volume_info_contents() looks like having a memory
corruption problem.
When UNCip is set to "&vol->UNC[2]" in cifs_parse_mount_options(), it
should not be kfree()-ed in cleanup_volume_info_contents().

Introduced in commit b946845a9dc523c759cae2b6a0f6827486c3221a

Signed-off-by: J.R. Okajima <hooanon05@...oo.co.jp>
Reviewed-by: Jeff Layton <jlayton@...hat.com>
Signed-off-by: Steve French <sfrench@...ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 fs/cifs/connect.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -2838,7 +2838,8 @@ cleanup_volume_info_contents(struct smb_
 	kfree(volume_info->username);
 	kzfree(volume_info->password);
 	kfree(volume_info->UNC);
-	kfree(volume_info->UNCip);
+	if (volume_info->UNCip != volume_info->UNC + 2)
+		kfree(volume_info->UNCip);
 	kfree(volume_info->domainname);
 	kfree(volume_info->iocharset);
 	kfree(volume_info->prepath);


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