linux-kernel - [ 07/17] cifs: Allow passwords which begin with a delimitor

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Message-Id: <20130415022353.167061004@linuxfoundation.org>
Date:	Sun, 14 Apr 2013 19:25:17 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Sachin Prabhu <sprabhu@...hat.com>,
	Jeff Layton <jlayton@...hat.com>,
	Steve French <sfrench@...ibm.com>
Subject: [ 07/17] cifs: Allow passwords which begin with a delimitor

3.4-stable review patch.  If anyone has any objections, please let me know.

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

From: Sachin Prabhu <sprabhu@...hat.com>

commit c369c9a4a7c82d33329d869cbaf93304cc7a0c40 upstream.

Fixes a regression in cifs_parse_mount_options where a password
which begins with a delimitor is parsed incorrectly as being a blank
password.

Signed-off-by: Sachin Prabhu <sprabhu@...hat.com>
Acked-by: Jeff Layton <jlayton@...hat.com>
Signed-off-by: Steve French <sfrench@...ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/cifs/connect.c |   16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -1576,14 +1576,24 @@ cifs_parse_mount_options(const char *mou
 			}
 			break;
 		case Opt_blank_pass:
-			vol->password = NULL;
-			break;
-		case Opt_pass:
 			/* passwords have to be handled differently
 			 * to allow the character used for deliminator
 			 * to be passed within them
 			 */
 
+			/*
+			 * Check if this is a case where the  password
+			 * starts with a delimiter
+			 */
+			tmp_end = strchr(data, '=');
+			tmp_end++;
+			if (!(tmp_end < end && tmp_end[1] == delim)) {
+				/* No it is not. Set the password to NULL */
+				vol->password = NULL;
+				break;
+			}
+			/* Yes it is. Drop down to Opt_pass below.*/
+		case Opt_pass:
 			/* Obtain the value string */
 			value = strchr(data, '=');
 			value++;


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