md/bitmap: protect against bitmap removal while being updated.

A write intent bitmap can be removed from an array while the
array is active.
When this happens, all IO is suspended and flushed before the
bitmap is removed.
However it is possible that bitmap_daemon_work is still running to
clear old bits from the bitmap.  If it is, it can dereference the
bitmap after it has been freed.

So introduce a new mutex to protect bitmap_daemon_work and get it
before destroying a bitmap.

This is suitable for any current -stable kernel.

Signed-off-by: NeilBrown <neilb@suse.de>
Cc: stable@kernel.org

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 5f154ef1e4be..1be7a16a7a53 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -363,6 +363,7 @@ static mddev_t * mddev_find(dev_t unit)
 
         mutex_init(&new->open_mutex);
         mutex_init(&new->reconfig_mutex);
+        mutex_init(&new->bitmap_mutex);
         INIT_LIST_HEAD(&new->disks);
         INIT_LIST_HEAD(&new->all_mddevs);
         init_timer(&new->safemode_timer);
@@ -6625,7 +6626,7 @@ void md_check_recovery(mddev_t *mddev)
 
 
         if (mddev->bitmap)
-                bitmap_daemon_work(mddev->bitmap);
+                bitmap_daemon_work(mddev);
 
         if (mddev->ro)
                 return;