[patch 54/54] BLUETOOTH: Fix locking in hci_sock_dev_event().

[Chris Wright <chrisw@sous-sol.org>]

-stable review patch.  If anyone has any objections, please let us know.
---------------------

From: Satyam Sharma <ssatyam@cse.iitk.ac.in>

We presently use lock_sock() to acquire a lock on a socket in
hci_sock_dev_event(), but this goes BUG because lock_sock()
can sleep and we're already holding a read-write spinlock at
that point. So, we must use the non-sleeping BH version,
bh_lock_sock().

However, hci_sock_dev_event() is called from user context and
hence using simply bh_lock_sock() will deadlock against a
concurrent softirq that tries to acquire a lock on the same
socket. Hence, disabling BH's before acquiring the socket lock
and enable them afterwards, is the proper solution to fix
socket locking in hci_sock_dev_event().

Signed-off-by: Satyam Sharma <ssatyam@cse.iitk.ac.in>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
 net/bluetooth/hci_sock.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- linux-2.6.21.4.orig/net/bluetooth/hci_sock.c
+++ linux-2.6.21.4/net/bluetooth/hci_sock.c
@@ -656,7 +656,8 @@ static int hci_sock_dev_event(struct not
 		/* Detach sockets from device */
 		read_lock(&hci_sk_list.lock);
 		sk_for_each(sk, node, &hci_sk_list.head) {
-			lock_sock(sk);
+			local_bh_disable();
+			bh_lock_sock_nested(sk);
 			if (hci_pi(sk)->hdev == hdev) {
 				hci_pi(sk)->hdev = NULL;
 				sk->sk_err = EPIPE;
@@ -665,7 +666,8 @@ static int hci_sock_dev_event(struct not
 
 				hci_dev_put(hdev);
 			}
-			release_sock(sk);
+			bh_unlock_sock(sk);
+			local_bh_enable();
 		}
 		read_unlock(&hci_sk_list.lock);
 	}

-- 
-
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