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authorBen Hutchings <ben@decadent.org.uk>2012-08-13 02:50:55 (GMT)
committerDavid S. Miller <davem@davemloft.net>2012-08-14 23:52:02 (GMT)
commitaadf31de16a7b2878af00a02e6557df84efa784b (patch)
tree8ad3aa78fdabdc1c60e5608b342ec1782eb72513 /net/llc
parentf4f8720febf0d785a054fc09bde5e3ad09728a58 (diff)
llc: Fix races between llc2 handler use and (un)registration
When registering the handlers, any state they rely on must be completely initialised first. When unregistering, we must wait until they are definitely no longer running. llc_rcv() must also avoid reading the handler pointers again after checking for NULL. Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/llc')
-rw-r--r--net/llc/llc_input.c21
-rw-r--r--net/llc/llc_station.c2
2 files changed, 18 insertions, 5 deletions
diff --git a/net/llc/llc_input.c b/net/llc/llc_input.c
index e32cab4..dd3e833 100644
--- a/net/llc/llc_input.c
+++ b/net/llc/llc_input.c
@@ -42,6 +42,7 @@ static void (*llc_type_handlers[2])(struct llc_sap *sap,
void llc_add_pack(int type, void (*handler)(struct llc_sap *sap,
struct sk_buff *skb))
{
+ smp_wmb(); /* ensure initialisation is complete before it's called */
if (type == LLC_DEST_SAP || type == LLC_DEST_CONN)
llc_type_handlers[type - 1] = handler;
}
@@ -50,11 +51,19 @@ void llc_remove_pack(int type)
{
if (type == LLC_DEST_SAP || type == LLC_DEST_CONN)
llc_type_handlers[type - 1] = NULL;
+ synchronize_net();
}
void llc_set_station_handler(void (*handler)(struct sk_buff *skb))
{
+ /* Ensure initialisation is complete before it's called */
+ if (handler)
+ smp_wmb();
+
llc_station_handler = handler;
+
+ if (!handler)
+ synchronize_net();
}
/**
@@ -150,6 +159,8 @@ int llc_rcv(struct sk_buff *skb, struct net_device *dev,
int dest;
int (*rcv)(struct sk_buff *, struct net_device *,
struct packet_type *, struct net_device *);
+ void (*sta_handler)(struct sk_buff *skb);
+ void (*sap_handler)(struct llc_sap *sap, struct sk_buff *skb);
if (!net_eq(dev_net(dev), &init_net))
goto drop;
@@ -182,7 +193,8 @@ int llc_rcv(struct sk_buff *skb, struct net_device *dev,
*/
rcv = rcu_dereference(sap->rcv_func);
dest = llc_pdu_type(skb);
- if (unlikely(!dest || !llc_type_handlers[dest - 1])) {
+ sap_handler = dest ? ACCESS_ONCE(llc_type_handlers[dest - 1]) : NULL;
+ if (unlikely(!sap_handler)) {
if (rcv)
rcv(skb, dev, pt, orig_dev);
else
@@ -193,7 +205,7 @@ int llc_rcv(struct sk_buff *skb, struct net_device *dev,
if (cskb)
rcv(cskb, dev, pt, orig_dev);
}
- llc_type_handlers[dest - 1](sap, skb);
+ sap_handler(sap, skb);
}
llc_sap_put(sap);
out:
@@ -202,9 +214,10 @@ drop:
kfree_skb(skb);
goto out;
handle_station:
- if (!llc_station_handler)
+ sta_handler = ACCESS_ONCE(llc_station_handler);
+ if (!sta_handler)
goto drop;
- llc_station_handler(skb);
+ sta_handler(skb);
goto out;
}
diff --git a/net/llc/llc_station.c b/net/llc/llc_station.c
index bba5184..b2f2bac 100644
--- a/net/llc/llc_station.c
+++ b/net/llc/llc_station.c
@@ -696,9 +696,9 @@ void __init llc_station_init(void)
(unsigned long)&llc_main_station);
llc_main_station.ack_timer.expires = jiffies +
sysctl_llc_station_ack_timeout;
- llc_set_station_handler(llc_station_rcv);
llc_main_station.maximum_retry = 1;
llc_main_station.state = LLC_STATION_STATE_UP;
+ llc_set_station_handler(llc_station_rcv);
}
void llc_station_exit(void)

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