From 52fe28832acd3a5174e94a3439af8d3b51968b37 Mon Sep 17 00:00:00 2001
From: Vladimir Zapolskiy <vz@mleia.com>
Date: Thu, 10 Mar 2016 01:22:19 +0200
Subject: [PATCH] dm log writes: fix check of kthread_run() return value
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(-)
diff --git a/drivers/md/dm-log-writes.c b/drivers/md/dm-log-writes.c
index 624589d51c2c..c2f29729dab1 100644
--- 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_target *ti, unsigned int argc, char **argv)
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);
--
2.34.1