From: Dan Williams <dan.j.williams@intel.com>
Date: Wed, 30 Apr 2008 18:55:30 +0000 (+0000)
Subject: md: fix use after free when removing rdev via sysfs
X-Git-Tag: v2.6.25.3~16
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=9bd2c7ca75b0ebe05b0c67852d050720119983e7;p=karo-tx-linux.git

md: fix use after free when removing rdev via sysfs

commit: 6a51830e14529063cb2685921e1177d9af50e49a upstream

rdev->mddev is no longer valid upon return from entry->store() when the
'remove' command is given.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 61ccbd2683fa..9f6d228b5607 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2096,7 +2096,7 @@ rdev_attr_store(struct kobject *kobj, struct attribute *attr,
 			rv = -EBUSY;
 		else
 			rv = entry->store(rdev, page, length);
-		mddev_unlock(rdev->mddev);
+		mddev_unlock(mddev);
 	}
 	return rv;
 }