netdev - [PATCH 3/4] bonding: the calling of bond->slave

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 for Android: free password hash cracker in your pocket

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

Message-ID: <51EA3B0D.7020501@huawei.com>
Date:	Sat, 20 Jul 2013 15:23:57 +0800
From:	Ding Tianhong <dingtianhong@...wei.com>
To:	Jay Vosburgh <fubar@...ibm.com>,
	Andy Gospodarek <andy@...yhouse.net>,
	"David S. Miller" <davem@...emloft.net>,
	Netdev <netdev@...r.kernel.org>
Subject: [PATCH 3/4] bonding: the calling of bond->slave_cnt need protection

The bonding_store_mode has rtnl protection, so no need to get read lock
for bond->slave_cnt, but the bonding_store_fail_over_mac need to protect
the bond->slave_cnt, so add read_lock().

Signed-off-by: Ding Tianhong <dingtianhong@...wei.com>
---
 drivers/net/bonding/bond_sysfs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index dc36a3d..d01a189 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -504,11 +504,14 @@ static ssize_t bonding_store_fail_over_mac(struct device *d,
 	int new_value;
 	struct bonding *bond = to_bond(d);
 
+	read_lock(&bond->lock);
 	if (bond->slave_cnt != 0) {
 		pr_err("%s: Can't alter fail_over_mac with slaves in bond.\n",
 		       bond->dev->name);
+		read_unlock(&bond->lock);
 		return -EPERM;
 	}
+	read_unlock(&bond->lock);
 
 	new_value = bond_parse_parm(buf, fail_over_mac_tbl);
 	if (new_value < 0) {
-- 
1.8.0


--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html