Re: [linux-cifs-client] [PATCH] cifs: fix oops on mount when CONFIG_CIFS_DFS_UPCALL is enabled

[Q (Igor Mammedov)]

A quick look trough cifs_mount and cifs_parse_mount_options functions shows
that mount will fail anyway with error EINVAL when 'data' = NULL.
May be moving NULL check at the beginning of function will be better
in this case.
From 83d523d13556e98283d0fe34394819f83368efb3 Mon Sep 17 00:00:00 2001
From: q <q@q-desktop.(none)>
Date: Sun, 8 Jun 2008 08:15:07 -0400
Subject: [PATCH] [CIFS] Fix OOPs when 'data' is NULL


Signed-off-by: niallain@xxxxxxxxx <q@q-desktop.(none)>
---
 fs/cifs/cifsfs.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index e9f4ec7..aee6b9d 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -102,6 +102,9 @@ cifs_read_super(struct super_block *sb, void *data,
 #endif
 	int rc = 0;
 
+	if (!data)
+		return -EINVAL;
+
 	/* BB should we make this contingent on mount parm? */
 	sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
 	sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
-- 
1.5.4.3