bridge: Clamp forward_delay when enabling STP

At some point limits were added to forward_delay.  However, the
limits are only enforced when STP is enabled.  This created a
scenario where you could have a value outside the allowed range
while STP is disabled, which then stuck around even after STP
is enabled.

This patch fixes this by clamping the value when we enable STP.

I had to move the locking around a bit to ensure that there is
no window where someone could insert a value outside the range
while we're in the middle of enabling STP.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Cheers,
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 26 insertions, 8 deletions

diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 598cb0b333c6..cda83158a21c 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -746,6 +746,7 @@ extern struct net_bridge_port *br_get_port(struct net_bridge *br,
 extern void br_init_port(struct net_bridge_port *p);
 extern void br_become_designated_port(struct net_bridge_port *p);
 
+extern void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
 extern int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 extern int br_set_hello_time(struct net_bridge *br, unsigned long x);
 extern int br_set_max_age(struct net_bridge *br, unsigned long x);
diff --git a/net/bridge/br_stp.c b/net/bridge/br_stp.c
index f1887ba7fc43..3c86f0538cbb 100644
--- a/net/bridge/br_stp.c
+++ b/net/bridge/br_stp.c
@@ -544,18 +544,27 @@ int br_set_max_age(struct net_bridge *br, unsigned long val)
 
 }
 
+void __br_set_forward_delay(struct net_bridge *br, unsigned long t)
+{
+        br->bridge_forward_delay = t;
+        if (br_is_root_bridge(br))
+                br->forward_delay = br->bridge_forward_delay;
+}
+
 int br_set_forward_delay(struct net_bridge *br, unsigned long val)
 {
         unsigned long t = clock_t_to_jiffies(val);
+        int err = -ERANGE;
 
+        spin_lock_bh(&br->lock);
         if (br->stp_enabled != BR_NO_STP &&
             (t < BR_MIN_FORWARD_DELAY || t > BR_MAX_FORWARD_DELAY))
-                return -ERANGE;
+                goto unlock;
 
-        spin_lock_bh(&br->lock);
-        br->bridge_forward_delay = t;
-        if (br_is_root_bridge(br))
-                br->forward_delay = br->bridge_forward_delay;
+        __br_set_forward_delay(br, t);
+        err = 0;
+
+unlock:
         spin_unlock_bh(&br->lock);
-        return 0;
+        return err;
 }
diff --git a/net/bridge/br_stp_if.c b/net/bridge/br_stp_if.c
index d45e760141bb..108084a04671 100644
--- a/net/bridge/br_stp_if.c
+++ b/net/bridge/br_stp_if.c
@@ -129,6 +129,14 @@ static void br_stp_start(struct net_bridge *br)
         char *envp[] = { NULL };
 
         r = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC);
+
+        spin_lock_bh(&br->lock);
+
+        if (br->bridge_forward_delay < BR_MIN_FORWARD_DELAY)
+                __br_set_forward_delay(br, BR_MIN_FORWARD_DELAY);
+        else if (br->bridge_forward_delay < BR_MAX_FORWARD_DELAY)
+                __br_set_forward_delay(br, BR_MAX_FORWARD_DELAY);
+
         if (r == 0) {
                 br->stp_enabled = BR_USER_STP;
                 br_debug(br, "userspace STP started\n");
@@ -137,10 +145,10 @@ static void br_stp_start(struct net_bridge *br)
                 br_debug(br, "using kernel STP\n");
 
                 /* To start timers on any ports left in blocking */
-                spin_lock_bh(&br->lock);
                 br_port_state_selection(br);
-                spin_unlock_bh(&br->lock);
         }
+
+        spin_unlock_bh(&br->lock);
 }
 
 static void br_stp_stop(struct net_bridge *br)