bridge: fix br_stp_set_bridge_priority race conditions

[ Upstream commit 2dab80a8b486f02222a69daca6859519e05781d9 ]

After the ->set() spinlocks were removed br_stp_set_bridge_priority
was left running without any protection when used via sysfs. It can
race with port add/del and could result in use-after-free cases and
corrupted lists. Tested by running port add/del in a loop with stp
enabled while setting priority in a loop, crashes are easily
reproducible.
The spinlocks around sysfs ->set() were removed in commit:
14f98f258f19 ("bridge: range check STP parameters")
There's also a race condition in the netlink priority support that is
fixed by this change, but it was introduced recently and the fixes tag
covers it, just in case it's needed the commit is:
af615762e972 ("bridge: add ageing_time, stp_state, priority over netlink")

Signed-off-by: Nikolay Aleksandrov <razor@blackwall.org>
Fixes: 14f98f258f19 ("bridge: range check STP parameters")
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/bridge/br_ioctl.c b/net/bridge/br_ioctl.c
index cd8c3a44ab7dccbdb82ddb0cba3fe0a8c2e978c0..b73eaba856675d68bf483af0eec30144f212106d 100644 (file)
--- a/net/bridge/br_ioctl.c
+++ b/net/bridge/br_ioctl.c
@@ -247,9 +247,7 @@ static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
                if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
                        return -EPERM;
 
-               spin_lock_bh(&br->lock);
                br_stp_set_bridge_priority(br, args[1]);
-               spin_unlock_bh(&br->lock);
                return 0;
 
        case BRCTL_SET_PORT_PRIORITY:

diff --git a/net/bridge/br_stp_if.c b/net/bridge/br_stp_if.c
index 656a6f3e40de1b13b9ea7a89373da5d5615e5bb2..886f6d6dc48a3f8c2749dc9c04dc422e248c5f35 100644 (file)
--- a/net/bridge/br_stp_if.c
+++ b/net/bridge/br_stp_if.c
@@ -241,12 +241,13 @@ bool br_stp_recalculate_bridge_id(struct net_bridge *br)
        return true;
 }
 
-/* called under bridge lock */
+/* Acquires and releases bridge lock */
 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio)
 {
        struct net_bridge_port *p;
        int wasroot;
 
+       spin_lock_bh(&br->lock);
        wasroot = br_is_root_bridge(br);
 
        list_for_each_entry(p, &br->port_list, list) {
@@ -264,6 +265,7 @@ void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio)
        br_port_state_selection(br);
        if (br_is_root_bridge(br) && !wasroot)
                br_become_root_bridge(br);
+       spin_unlock_bh(&br->lock);
 }
 
 /* called under bridge lock */