Patch "dm log writes: fix check of kthread_run() return value" has been added to the 4.7-stable tree

Patch "dm log writes: fix check of kthread_run() return value" has been added to the 4.7-stable tree

[gregkh]

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 4.7-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-4.7 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 91e630d9ae6de6f740ef7c8176736eb55366833e Mon Sep 17 00:00:00 2001
From: Vladimir Zapolskiy <vz@mleia.com>
Date: Thu, 10 Mar 2016 01:22:19 +0200
Subject: dm log writes: fix check of kthread_run() return value

From: Vladimir Zapolskiy <vz@mleia.com>

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.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

--- a/drivers/md/dm-log-writes.c
+++ b/drivers/md/dm-log-writes.c
@@ -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 vz@mleia.com are

queue-4.7/dm-log-writes-fix-check-of-kthread_run-return-value.patch