linux-kernel - [RESENT PATCH] mm/memory_hotplug: Do not unlock when fails to take the device_hotplug

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <1554696437-9593-1-git-send-email-zhongjiang@huawei.com>
Date:   Mon, 8 Apr 2019 12:07:17 +0800
From:   zhong jiang <zhongjiang@...wei.com>
To:     <akpm@...ux-foundation.org>, <rafael@...nel.org>,
        <david@...hat.com>, <rafael.j.wysocki@...el.com>,
        <mhocko@...e.com>, <osalvador@...e.de>
CC:     <vbabka@...e.cz>, <iamjoonsoo.kim@....com>,
        <bsingharora@...il.com>, <gregkh@...uxfoundation.org>,
        <yangyingliang@...wei.com>, <linux-kernel@...r.kernel.org>,
        <linux-mm@...ck.org>
Subject: [RESENT PATCH] mm/memory_hotplug: Do not unlock when fails to take the device_hotplug_lock

When adding the memory by probing memory block in sysfs interface, there is an
obvious issue that we will unlock the device_hotplug_lock when fails to takes it.

That issue was introduced in Commit 8df1d0e4a265
("mm/memory_hotplug: make add_memory() take the device_hotplug_lock")

We should drop out in time when fails to take the device_hotplug_lock.

Fixes: 8df1d0e4a265 ("mm/memory_hotplug: make add_memory() take the device_hotplug_lock")
Reported-by: Yang yingliang <yangyingliang@...wei.com>
Signed-off-by: zhong jiang <zhongjiang@...wei.com>
---
 drivers/base/memory.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index d9ebb89..0c9e22f 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -507,7 +507,7 @@ static ssize_t probe_store(struct device *dev, struct device_attribute *attr,
 
 	ret = lock_device_hotplug_sysfs();
 	if (ret)
-		goto out;
+		return ret;
 
 	nid = memory_add_physaddr_to_nid(phys_addr);
 	ret = __add_memory(nid, phys_addr,
-- 
1.7.12.4