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authorJohan Hedberg <johan.hedberg@intel.com>2012-06-06 18:44:11 +0800
committerGustavo Padovan <gustavo.padovan@collabora.co.uk>2012-06-08 03:23:56 -0300
commitd06cc416f517a25713dedd9e2a9ccf4f3086c09a (patch)
tree4faf0f0e7f32bc66705f75d3f82d8db503e93741 /net
parent4c47d7396420160d27209f578680141874c0110b (diff)
Bluetooth: Fix deadlock and crash when SMP pairing times out
The l2cap_conn_del function tries to cancel_sync the security timer, but when it's called from the timeout function itself a deadlock occurs. Subsequently the "hcon->l2cap_data = NULL" that's supposed to protect multiple calls to l2cap_conn_del never gets cleared and when the connection finally drops we double free's etc which will crash the kernel. This patch fixes the issue by using the HCI_CONN_LE_SMP_PEND for protecting against this. The same flag is also used for the same purpose in other places in the SMP code. Signed-off-by: Johan Hedberg <johan.hedberg@intel.com> Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Diffstat (limited to 'net')
-rw-r--r--net/bluetooth/l2cap_core.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 24f144b72a9..8394e3615ef 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -1295,7 +1295,12 @@ static void security_timeout(struct work_struct *work)
struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
security_timer.work);
- l2cap_conn_del(conn->hcon, ETIMEDOUT);
+ BT_DBG("conn %p", conn);
+
+ if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) {
+ smp_chan_destroy(conn);
+ l2cap_conn_del(conn->hcon, ETIMEDOUT);
+ }
}
static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)