[PATCH] cifs: fix rare oops in cifs_close

Protect access to cifs file list in cifs_close path

Signed-off-by: Steve French (sfrench@us.ibm.com)
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

fs/cifs/CHANGES

@@ -6,7 +6,8 @@ Add support for lsattr (getting ext2/ext3/reiserfs attr flags from the server)
 as new protocol extensions. Do not send Get/Set calls for POSIX ACLs
 unless server explicitly claims to support them in CIFS Unix extensions
 POSIX ACL capability bit. Fix packet signing when multiuser mounting with
-different users from the same client to the same server.
+different users from the same client to the same server. Fix oops in
+cifs_close.
 
 Version 1.31
 ------------

fs/cifs/file.c

@@ -465,8 +465,10 @@ int cifs_close(struct inode *inode, struct file *file)
 				write_lock(&file->f_owner.lock);
 			}
 		}
+		write_lock(&GlobalSMBSeslock);
 		list_del(&pSMBFile->flist);
 		list_del(&pSMBFile->tlist);
+		write_unlock(&GlobalSMBSeslock);
 		write_unlock(&file->f_owner.lock);
 		kfree(pSMBFile->search_resume_name);
 		kfree(file->private_data);