Patch "dm log writes: fix check of kthread_run() return value" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

dm log writes: fix check of kthread_run() return value

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
dm-log-writes-fix-check-of-kthread_run-return-value.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Vladimir Zapolskiy <[email protected]>
Date: Thu, 10 Mar 2016 01:22:19 +0200
Subject: dm log writes: fix check of kthread_run() return value

From: Vladimir Zapolskiy <[email protected]>

commit 91e630d9ae6de6f740ef7c8176736eb55366833e upstream.

The kthread_run() function returns either a valid task_struct or ERR_PTR() value, check for NULL is invalid. This change fixes potential for oops, e.g. in OOM situation.

---
 drivers/md/dm-log-writes.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

@@ -456,9 +456,9 @@ static int log_writes_ctr(struct dm_targ
 		goto bad;
 	}
 
-	ret = -EINVAL;
 	lc->log_kthread = kthread_run(log_writes_kthread, lc, "log-write");
-	if (!lc->log_kthread) {
+	if (IS_ERR(lc->log_kthread)) {
+		ret = PTR_ERR(lc->log_kthread);
 		ti->error = "Couldn't alloc kthread";
 		dm_put_device(ti, lc->dev);
 		dm_put_device(ti, lc->logdev);

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/dm-log-writes-fix-check-of-kthread_run-return-value.patch