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authorYing Xue <ying.xue@windriver.com>2013-12-27 06:18:28 +0400
committerDavid S. Miller <davem@davemloft.net>2013-12-30 07:24:07 +0400
commit84602761ca4495dd409be936dfa93ed20c946684 (patch)
tree5936e501cc24cc66cf298a8e6713cbb04b4427b0 /net/tipc
parent8eb9bff0edefcce50116ec50397a60dd626022d6 (diff)
downloadlinux-84602761ca4495dd409be936dfa93ed20c946684.tar.xz
tipc: fix deadlock during socket release
A deadlock might occur if name table is withdrawn in socket release routine, and while packets are still being received from bearer. CPU0 CPU1 T0: recv_msg() release() T1: tipc_recv_msg() tipc_withdraw() T2: [grab node lock] [grab port lock] T3: tipc_link_wakeup_ports() tipc_nametbl_withdraw() T4: [grab port lock]* named_cluster_distribute() T5: wakeupdispatch() tipc_link_send() T6: [grab node lock]* The opposite order of holding port lock and node lock on above two different paths may result in a deadlock. If socket lock instead of port lock is used to protect port instance in tipc_withdraw(), the reverse order of holding port lock and node lock will be eliminated, as a result, the deadlock is killed as well. Reported-by: Lars Everbrand <lars.everbrand@ericsson.com> Reviewed-by: Erik Hugne <erik.hugne@ericsson.com> Signed-off-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/tipc')
-rw-r--r--net/tipc/port.c45
-rw-r--r--net/tipc/port.h6
-rw-r--r--net/tipc/socket.c46
3 files changed, 49 insertions, 48 deletions
diff --git a/net/tipc/port.c b/net/tipc/port.c
index c081a7632302..d43f3182b1d4 100644
--- a/net/tipc/port.c
+++ b/net/tipc/port.c
@@ -251,18 +251,15 @@ struct tipc_port *tipc_createport(struct sock *sk,
return p_ptr;
}
-int tipc_deleteport(u32 ref)
+int tipc_deleteport(struct tipc_port *p_ptr)
{
- struct tipc_port *p_ptr;
struct sk_buff *buf = NULL;
- tipc_withdraw(ref, 0, NULL);
- p_ptr = tipc_port_lock(ref);
- if (!p_ptr)
- return -EINVAL;
+ tipc_withdraw(p_ptr, 0, NULL);
- tipc_ref_discard(ref);
- tipc_port_unlock(p_ptr);
+ spin_lock_bh(p_ptr->lock);
+ tipc_ref_discard(p_ptr->ref);
+ spin_unlock_bh(p_ptr->lock);
k_cancel_timer(&p_ptr->timer);
if (p_ptr->connected) {
@@ -704,47 +701,36 @@ int tipc_set_portimportance(u32 ref, unsigned int imp)
}
-int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
+int tipc_publish(struct tipc_port *p_ptr, unsigned int scope,
+ struct tipc_name_seq const *seq)
{
- struct tipc_port *p_ptr;
struct publication *publ;
u32 key;
- int res = -EINVAL;
- p_ptr = tipc_port_lock(ref);
- if (!p_ptr)
+ if (p_ptr->connected)
return -EINVAL;
+ key = p_ptr->ref + p_ptr->pub_count + 1;
+ if (key == p_ptr->ref)
+ return -EADDRINUSE;
- if (p_ptr->connected)
- goto exit;
- key = ref + p_ptr->pub_count + 1;
- if (key == ref) {
- res = -EADDRINUSE;
- goto exit;
- }
publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
scope, p_ptr->ref, key);
if (publ) {
list_add(&publ->pport_list, &p_ptr->publications);
p_ptr->pub_count++;
p_ptr->published = 1;
- res = 0;
+ return 0;
}
-exit:
- tipc_port_unlock(p_ptr);
- return res;
+ return -EINVAL;
}
-int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
+int tipc_withdraw(struct tipc_port *p_ptr, unsigned int scope,
+ struct tipc_name_seq const *seq)
{
- struct tipc_port *p_ptr;
struct publication *publ;
struct publication *tpubl;
int res = -EINVAL;
- p_ptr = tipc_port_lock(ref);
- if (!p_ptr)
- return -EINVAL;
if (!seq) {
list_for_each_entry_safe(publ, tpubl,
&p_ptr->publications, pport_list) {
@@ -771,7 +757,6 @@ int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
}
if (list_empty(&p_ptr->publications))
p_ptr->published = 0;
- tipc_port_unlock(p_ptr);
return res;
}
diff --git a/net/tipc/port.h b/net/tipc/port.h
index 912253597343..34f12bd4074e 100644
--- a/net/tipc/port.h
+++ b/net/tipc/port.h
@@ -116,7 +116,7 @@ int tipc_reject_msg(struct sk_buff *buf, u32 err);
void tipc_acknowledge(u32 port_ref, u32 ack);
-int tipc_deleteport(u32 portref);
+int tipc_deleteport(struct tipc_port *p_ptr);
int tipc_portimportance(u32 portref, unsigned int *importance);
int tipc_set_portimportance(u32 portref, unsigned int importance);
@@ -127,9 +127,9 @@ int tipc_set_portunreliable(u32 portref, unsigned int isunreliable);
int tipc_portunreturnable(u32 portref, unsigned int *isunreturnable);
int tipc_set_portunreturnable(u32 portref, unsigned int isunreturnable);
-int tipc_publish(u32 portref, unsigned int scope,
+int tipc_publish(struct tipc_port *p_ptr, unsigned int scope,
struct tipc_name_seq const *name_seq);
-int tipc_withdraw(u32 portref, unsigned int scope,
+int tipc_withdraw(struct tipc_port *p_ptr, unsigned int scope,
struct tipc_name_seq const *name_seq);
int tipc_connect(u32 portref, struct tipc_portid const *port);
diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 3b61851bb927..e741416d1d24 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -354,7 +354,7 @@ static int release(struct socket *sock)
* Delete TIPC port; this ensures no more messages are queued
* (also disconnects an active connection & sends a 'FIN-' to peer)
*/
- res = tipc_deleteport(tport->ref);
+ res = tipc_deleteport(tport);
/* Discard any remaining (connection-based) messages in receive queue */
__skb_queue_purge(&sk->sk_receive_queue);
@@ -386,30 +386,46 @@ static int release(struct socket *sock)
*/
static int bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len)
{
+ struct sock *sk = sock->sk;
struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
- u32 portref = tipc_sk_port(sock->sk)->ref;
+ struct tipc_port *tport = tipc_sk_port(sock->sk);
+ int res = -EINVAL;
- if (unlikely(!uaddr_len))
- return tipc_withdraw(portref, 0, NULL);
+ lock_sock(sk);
+ if (unlikely(!uaddr_len)) {
+ res = tipc_withdraw(tport, 0, NULL);
+ goto exit;
+ }
- if (uaddr_len < sizeof(struct sockaddr_tipc))
- return -EINVAL;
- if (addr->family != AF_TIPC)
- return -EAFNOSUPPORT;
+ if (uaddr_len < sizeof(struct sockaddr_tipc)) {
+ res = -EINVAL;
+ goto exit;
+ }
+ if (addr->family != AF_TIPC) {
+ res = -EAFNOSUPPORT;
+ goto exit;
+ }
if (addr->addrtype == TIPC_ADDR_NAME)
addr->addr.nameseq.upper = addr->addr.nameseq.lower;
- else if (addr->addrtype != TIPC_ADDR_NAMESEQ)
- return -EAFNOSUPPORT;
+ else if (addr->addrtype != TIPC_ADDR_NAMESEQ) {
+ res = -EAFNOSUPPORT;
+ goto exit;
+ }
if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) &&
(addr->addr.nameseq.type != TIPC_TOP_SRV) &&
- (addr->addr.nameseq.type != TIPC_CFG_SRV))
- return -EACCES;
+ (addr->addr.nameseq.type != TIPC_CFG_SRV)) {
+ res = -EACCES;
+ goto exit;
+ }
- return (addr->scope > 0) ?
- tipc_publish(portref, addr->scope, &addr->addr.nameseq) :
- tipc_withdraw(portref, -addr->scope, &addr->addr.nameseq);
+ res = (addr->scope > 0) ?
+ tipc_publish(tport, addr->scope, &addr->addr.nameseq) :
+ tipc_withdraw(tport, -addr->scope, &addr->addr.nameseq);
+exit:
+ release_sock(sk);
+ return res;
}
/**