get_sb_single() - do not pass options twice

[Kay Sievers <kay.sievers@vrfy.org>]

From: Kay Sievers <kay.sievers@vrfy.org>
Subject: vfs: get_sb_single() - do not pass options twice

Filesystem code usually destroys the option buffer while
parsing it, which leads to errors when the same buffer is
passed twice. In case we fill a new superblock with the
options, do not pass the options again to the remount()
call.

Cc: Greg KH <greg@kroah.com>
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
---
 fs/super.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/super.c
+++ b/fs/super.c
@@ -900,6 +900,8 @@ int get_sb_single(struct file_system_typ
 			deactivate_locked_super(s);
 			return error;
 		}
+		/* options usually get mangled and can only be parsed once */
+		data = NULL;
 		s->s_flags |= MS_ACTIVE;
 	}
 	do_remount_sb(s, flags, data, 0);