linux-kernel - [PATCH 4.4 219/230] md: Fix failed allocation of md_register

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Date:   Fri, 22 Mar 2019 12:15:57 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Guoqing Jiang <gqjiang@...e.com>,
        Aditya Pakki <pakki001@....edu>,
        Song Liu <songliubraving@...com>
Subject: [PATCH 4.4 219/230] md: Fix failed allocation of md_register_thread

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Aditya Pakki <pakki001@....edu>

commit e406f12dde1a8375d77ea02d91f313fb1a9c6aec upstream.

mddev->sync_thread can be set to NULL on kzalloc failure downstream.
The patch checks for such a scenario and frees allocated resources.

Committer node:

Added similar fix to raid5.c, as suggested by Guoqing.

Cc: stable@...r.kernel.org # v3.16+
Acked-by: Guoqing Jiang <gqjiang@...e.com>
Signed-off-by: Aditya Pakki <pakki001@....edu>
Signed-off-by: Song Liu <songliubraving@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/md/raid10.c |    2 ++
 drivers/md/raid5.c  |    2 ++
 2 files changed, 4 insertions(+)

--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -3755,6 +3755,8 @@ static int run(struct mddev *mddev)
 		set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
 		mddev->sync_thread = md_register_thread(md_do_sync, mddev,
 							"reshape");
+		if (!mddev->sync_thread)
+			goto out_free_conf;
 	}
 
 	return 0;
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -6973,6 +6973,8 @@ static int run(struct mddev *mddev)
 		set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
 		mddev->sync_thread = md_register_thread(md_do_sync, mddev,
 							"reshape");
+		if (!mddev->sync_thread)
+			goto abort;
 	}
 
 	/* Ok, everything is just fine now */