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authorMarcel Holtmann <marcel@holtmann.org>2007-01-25 20:38:15 +0100
committerAdrian Bunk <bunk@stusta.de>2007-01-26 20:49:22 +0100
commitc2afb6058b25bc201d7ca24e2541941d09d03ae9 (patch)
tree97fcec4a42a3d4faa21ca188b74cba4ccd1a533c
parentac4d63dab8bb425f1ae037abf349090c12f16883 (diff)
[Bluetooth] Add locking for bt_proto array manipulation
The bt_proto array needs to be protected by some kind of locking to prevent a race condition between bt_sock_create and bt_sock_register. And in addition all calls to sk_alloc need to be made GFP_ATOMIC now. Signed-off-by: Masatake YAMATO <jet@gyve.org> Signed-off-by: Frederik Deweerdt <frederik.deweerdt@gmail.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: Adrian Bunk <bunk@stusta.de>
-rw-r--r--net/bluetooth/af_bluetooth.c36
-rw-r--r--net/bluetooth/bnep/sock.c2
-rw-r--r--net/bluetooth/cmtp/sock.c2
-rw-r--r--net/bluetooth/hci_sock.c2
-rw-r--r--net/bluetooth/hidp/sock.c2
-rw-r--r--net/bluetooth/l2cap.c2
-rw-r--r--net/bluetooth/rfcomm/sock.c3
-rw-r--r--net/bluetooth/sco.c3
8 files changed, 38 insertions, 14 deletions
diff --git a/net/bluetooth/af_bluetooth.c b/net/bluetooth/af_bluetooth.c
index 6ebcc8d4b559..8587844b8756 100644
--- a/net/bluetooth/af_bluetooth.c
+++ b/net/bluetooth/af_bluetooth.c
@@ -54,36 +54,51 @@
/* Bluetooth sockets */
#define BT_MAX_PROTO 8
static struct net_proto_family *bt_proto[BT_MAX_PROTO];
+static DEFINE_RWLOCK(bt_proto_lock);
int bt_sock_register(int proto, struct net_proto_family *ops)
{
+ int err = 0;
+
if (proto < 0 || proto >= BT_MAX_PROTO)
return -EINVAL;
+ write_lock(&bt_proto_lock);
+
if (bt_proto[proto])
- return -EEXIST;
+ err = -EEXIST;
+ else
+ bt_proto[proto] = ops;
- bt_proto[proto] = ops;
- return 0;
+ write_unlock(&bt_proto_lock);
+
+ return err;
}
EXPORT_SYMBOL(bt_sock_register);
int bt_sock_unregister(int proto)
{
+ int err = 0;
+
if (proto < 0 || proto >= BT_MAX_PROTO)
return -EINVAL;
+ write_lock(&bt_proto_lock);
+
if (!bt_proto[proto])
- return -ENOENT;
+ err = -ENOENT;
+ else
+ bt_proto[proto] = NULL;
- bt_proto[proto] = NULL;
- return 0;
+ write_unlock(&bt_proto_lock);
+
+ return err;
}
EXPORT_SYMBOL(bt_sock_unregister);
static int bt_sock_create(struct socket *sock, int proto)
{
- int err = 0;
+ int err;
if (proto < 0 || proto >= BT_MAX_PROTO)
return -EINVAL;
@@ -93,11 +108,18 @@ static int bt_sock_create(struct socket *sock, int proto)
request_module("bt-proto-%d", proto);
}
#endif
+
err = -EPROTONOSUPPORT;
+
+ read_lock(&bt_proto_lock);
+
if (bt_proto[proto] && try_module_get(bt_proto[proto]->owner)) {
err = bt_proto[proto]->create(sock, proto);
module_put(bt_proto[proto]->owner);
}
+
+ read_unlock(&bt_proto_lock);
+
return err;
}
diff --git a/net/bluetooth/bnep/sock.c b/net/bluetooth/bnep/sock.c
index 8f7da1eac83e..e9b63e61c839 100644
--- a/net/bluetooth/bnep/sock.c
+++ b/net/bluetooth/bnep/sock.c
@@ -215,7 +215,7 @@ static int bnep_sock_create(struct socket *sock, int protocol)
if (sock->type != SOCK_RAW)
return -ESOCKTNOSUPPORT;
- sk = sk_alloc(PF_BLUETOOTH, GFP_KERNEL, &bnep_proto, 1);
+ sk = sk_alloc(PF_BLUETOOTH, GFP_ATOMIC, &bnep_proto, 1);
if (!sk)
return -ENOMEM;
diff --git a/net/bluetooth/cmtp/sock.c b/net/bluetooth/cmtp/sock.c
index 84345d4e3c18..d29e870bb379 100644
--- a/net/bluetooth/cmtp/sock.c
+++ b/net/bluetooth/cmtp/sock.c
@@ -206,7 +206,7 @@ static int cmtp_sock_create(struct socket *sock, int protocol)
if (sock->type != SOCK_RAW)
return -ESOCKTNOSUPPORT;
- sk = sk_alloc(PF_BLUETOOTH, GFP_KERNEL, &cmtp_proto, 1);
+ sk = sk_alloc(PF_BLUETOOTH, GFP_ATOMIC, &cmtp_proto, 1);
if (!sk)
return -ENOMEM;
diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c
index 4e86ff478352..ed117dbe00d4 100644
--- a/net/bluetooth/hci_sock.c
+++ b/net/bluetooth/hci_sock.c
@@ -622,7 +622,7 @@ static int hci_sock_create(struct socket *sock, int protocol)
sock->ops = &hci_sock_ops;
- sk = sk_alloc(PF_BLUETOOTH, GFP_KERNEL, &hci_sk_proto, 1);
+ sk = sk_alloc(PF_BLUETOOTH, GFP_ATOMIC, &hci_sk_proto, 1);
if (!sk)
return -ENOMEM;
diff --git a/net/bluetooth/hidp/sock.c b/net/bluetooth/hidp/sock.c
index 02c94eb000b6..9ebab48b6c7f 100644
--- a/net/bluetooth/hidp/sock.c
+++ b/net/bluetooth/hidp/sock.c
@@ -257,7 +257,7 @@ static int hidp_sock_create(struct socket *sock, int protocol)
if (sock->type != SOCK_RAW)
return -ESOCKTNOSUPPORT;
- sk = sk_alloc(PF_BLUETOOTH, GFP_KERNEL, &hidp_proto, 1);
+ sk = sk_alloc(PF_BLUETOOTH, GFP_ATOMIC, &hidp_proto, 1);
if (!sk)
return -ENOMEM;
diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index f6b4a8085357..fc1b54fb0ad2 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -414,7 +414,7 @@ static int l2cap_sock_create(struct socket *sock, int protocol)
sock->ops = &l2cap_sock_ops;
- sk = l2cap_sock_alloc(sock, protocol, GFP_KERNEL);
+ sk = l2cap_sock_alloc(sock, protocol, GFP_ATOMIC);
if (!sk)
return -ENOMEM;
diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c
index f133a1aba3d9..54f2a7c91c66 100644
--- a/net/bluetooth/rfcomm/sock.c
+++ b/net/bluetooth/rfcomm/sock.c
@@ -337,7 +337,8 @@ static int rfcomm_sock_create(struct socket *sock, int protocol)
sock->ops = &rfcomm_sock_ops;
- if (!(sk = rfcomm_sock_alloc(sock, protocol, GFP_KERNEL)))
+ sk = rfcomm_sock_alloc(sock, protocol, GFP_ATOMIC);
+ if (!sk)
return -ENOMEM;
rfcomm_sock_init(sk, NULL);
diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index 6b61323ce23c..d0ed1011b883 100644
--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -455,7 +455,8 @@ static int sco_sock_create(struct socket *sock, int protocol)
sock->ops = &sco_sock_ops;
- if (!(sk = sco_sock_alloc(sock, protocol, GFP_KERNEL)))
+ sk = sco_sock_alloc(sock, protocol, GFP_ATOMIC);
+ if (!sk)
return -ENOMEM;
sco_sock_init(sk, NULL);