linux-kernel - [PATCH 3.16 073/212] w1: don't leak refcount on slave attach failure in w1_attach_slave

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Message-ID: <lsq.1496331796.581522094@decadent.org.uk>
Date:   Thu, 01 Jun 2017 16:43:16 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>,
        "Evgeniy Polyakov" <zbr@...emap.net>
Subject: [PATCH 3.16 073/212] w1: don't leak refcount on slave attach
 failure in w1_attach_slave_device()

3.16.44-rc1 review patch.  If anyone has any objections, please let me know.

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

From: "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>

commit d2ce4ea1a0b0162e5d2d7e7942ab6f5cc2063d5a upstream.

Near the beginning of w1_attach_slave_device() we increment a w1 master
reference count.
Later, when we are going to exit this function without actually attaching
a slave device (due to failure of __w1_attach_slave_device()) we need to
decrement this reference count back.

Signed-off-by: Maciej S. Szmigiero <mail@...iej.szmigiero.name>
Fixes: 9fcbbac5ded489 ("w1: process w1 netlink commands in w1_process thread")
Cc: Evgeniy Polyakov <zbr@...emap.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/w1/w1.c | 1 +
 1 file changed, 1 insertion(+)

--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -749,6 +749,7 @@ int w1_attach_slave_device(struct w1_mas
 		dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__,
 			 sl->name);
 		w1_family_put(sl->family);
+		atomic_dec(&sl->master->refcnt);
 		kfree(sl);
 		return err;
 	}