From: NeilBrown <neilb@suse.de>
Date: Mon, 19 Mar 2012 01:46:37 +0000 (+1100)
Subject: md/bitmap: ensure to load bitmap when creating via sysfs.
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=4474ca42e2577563a919fd3ed782e2ec55bf11a2;p=linux-beck.git

md/bitmap: ensure to load bitmap when creating via sysfs.

When commit 69e51b449d383e (md/bitmap:  separate out loading a bitmap...)
created bitmap_load, it missed calling it after bitmap_create when a
bitmap is created through the sysfs interface.
So if a bitmap is added this way, we don't allocate memory properly
and can crash.

This is suitable for any -stable release since 2.6.35.
Cc: stable@vger.kernel.org
Signed-off-by: NeilBrown <neilb@suse.de>
---

diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index cdf36b1e9aa6..239af9a9aad1 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -1904,6 +1904,8 @@ location_store(struct mddev *mddev, const char *buf, size_t len)
 			if (mddev->pers) {
 				mddev->pers->quiesce(mddev, 1);
 				rv = bitmap_create(mddev);
+				if (!rv)
+					rv = bitmap_load(mddev);
 				if (rv) {
 					bitmap_destroy(mddev);
 					mddev->bitmap_info.offset = 0;