Re: Kernel null pointer dereference on stopping raid device

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On 6/14/2023 7:31 PM, Christoph Hellwig wrote:
On Wed, Jun 14, 2023 at 09:54:07AM +0000, Jain, Ayush wrote:
Patch applied cleanly on next-20230614 and resolved the issue.

Reported-by: Ayush Jain <ayush.jain3@xxxxxxx>
Tested-by: Ayush Jain <ayush.jain3@xxxxxxx>

That was just a quick hack to verify the problem.  I think this is
the proper fix, can you try it as well?


Sure, this works on my machine.

Tested-by: Ayush Jain <ayush.jain3@xxxxxxx>

diff --git a/drivers/md/md.c b/drivers/md/md.c
index ca0de7ddd9434d..da523e80a4e990 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2467,10 +2467,12 @@ static void export_rdev(struct md_rdev *rdev, struct mddev *mddev)
static void md_kick_rdev_from_array(struct md_rdev *rdev)
  {
-	bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
+	struct mddev *mddev = rdev->mddev;
+
+	bd_unlink_disk_holder(rdev->bdev, mddev->gendisk);
  	list_del_rcu(&rdev->same_set);
  	pr_debug("md: unbind<%pg>\n", rdev->bdev);
-	mddev_destroy_serial_pool(rdev->mddev, rdev, false);
+	mddev_destroy_serial_pool(mddev, rdev, false);
  	rdev->mddev = NULL;
  	sysfs_remove_link(&rdev->kobj, "block");
  	sysfs_put(rdev->sysfs_state);
@@ -2488,7 +2490,7 @@ static void md_kick_rdev_from_array(struct md_rdev *rdev)
  	INIT_WORK(&rdev->del_work, rdev_delayed_delete);
  	kobject_get(&rdev->kobj);
  	queue_work(md_rdev_misc_wq, &rdev->del_work);
-	export_rdev(rdev, rdev->mddev);
+	export_rdev(rdev, mddev);
  }
static void export_array(struct mddev *mddev)

Thanks & Regards,
Ayush Jain



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