linux-kernel - [04/21] CIFS: Fix memory over bound bug in cifs_parse_mount

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Message-Id: <20110519182436.693934887@clark.kroah.org>
Date:	Thu, 19 May 2011 11:23:34 -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,
	Pavel Shilovsky <piastry@...rsoft.ru>,
	Steve French <sfrench@...ibm.com>
Subject: [04/21] CIFS: Fix memory over bound bug in cifs_parse_mount_options

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

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

From: Pavel Shilovsky <piastry@...rsoft.ru>

commit 4906e50b37e6f6c264e7ee4237343eb2b7f8d16d upstream.

While password processing we can get out of options array bound if
the next character after array is delimiter. The patch adds a check
if we reach the end.

Signed-off-by: Pavel Shilovsky <piastry@...rsoft.ru>
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 |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -799,8 +799,7 @@ static int
 cifs_parse_mount_options(char *options, const char *devname,
 			 struct smb_vol *vol)
 {
-	char *value;
-	char *data;
+	char *value, *data, *end;
 	unsigned int  temp_len, i, j;
 	char separator[2];
 	short int override_uid = -1;
@@ -843,6 +842,7 @@ cifs_parse_mount_options(char *options,
 	if (!options)
 		return 1;
 
+	end = options + strlen(options);
 	if (strncmp(options, "sep=", 4) == 0) {
 		if (options[4] != 0) {
 			separator[0] = options[4];
@@ -907,6 +907,7 @@ cifs_parse_mount_options(char *options,
 			the only illegal character in a password is null */
 
 			if ((value[temp_len] == 0) &&
+			    (value + temp_len < end) &&
 			    (value[temp_len+1] == separator[0])) {
 				/* reinsert comma */
 				value[temp_len] = separator[0];


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