md: clear mddev->private when it has been freed.

If ->private is set when ->run is called, it is assumed to be
a 'config'  prepared as part of 'reshape'.

So it is important when we free that config, that we also clear ->private.
This is not often a problem as the mddev will normally be discarded
shortly after the config us freed.
However if an 'assemble' races with a final close, the assemble can use
the old mddev which has a stale ->private.  This leads to any of
various sorts of crashes.

So clear ->private after calling ->free().

Reported-by: Nate Clark <nate@neworld.us>
Cc: stable@vger.kernel.org (v4.0+)
Fixes: afa0f557cb15 ("md: rename ->stop to ->free")
Signed-off-by: NeilBrown <neilb@suse.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 3d339e283cf6..939739f0f881 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -5178,6 +5178,7 @@ int md_run(struct mddev *mddev)
                 mddev_detach(mddev);
                 if (mddev->private)
                         pers->free(mddev, mddev->private);
+                mddev->private = NULL;
                 module_put(pers->owner);
                 bitmap_destroy(mddev);
                 return err;
@@ -5313,6 +5314,7 @@ static void md_clean(struct mddev *mddev)
         mddev->changed = 0;
         mddev->degraded = 0;
         mddev->safemode = 0;
+        mddev->private = NULL;
         mddev->merge_check_needed = 0;
         mddev->bitmap_info.offset = 0;
         mddev->bitmap_info.default_offset = 0;
@@ -5385,6 +5387,7 @@ static void __md_stop(struct mddev *mddev)
         mddev->pers = NULL;
         spin_unlock(&mddev->lock);
         pers->free(mddev, mddev->private);
+        mddev->private = NULL;
         if (pers->sync_request && mddev->to_remove == NULL)
                 mddev->to_remove = &md_redundancy_group;
         module_put(pers->owner);