6.13-stable review patch. If anyone has any objections, please let me know.
------------------
From: Luiz Augusto von Dentz luiz.von.dentz@intel.com
commit ab4eedb790cae44313759b50fe47da285e2519d5 upstream.
This fixes the following trace by reworking the locking of l2cap_conn so instead of only locking when changing the chan_l list this promotes chan_lock to a general lock of l2cap_conn so whenever it is being held it would prevents the likes of l2cap_conn_del to run:
list_del corruption, ffff888021297e00->prev is LIST_POISON2 (dead000000000122) ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:61! Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 1 UID: 0 PID: 5896 Comm: syz-executor213 Not tainted 6.14.0-rc1-next-20250204-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 RIP: 0010:__list_del_entry_valid_or_report+0x12c/0x190 lib/list_debug.c:59 Code: 8c 4c 89 fe 48 89 da e8 32 8c 37 fc 90 0f 0b 48 89 df e8 27 9f 14 fd 48 c7 c7 a0 c0 60 8c 4c 89 fe 48 89 da e8 15 8c 37 fc 90 <0f> 0b 4c 89 e7 e8 0a 9f 14 fd 42 80 3c 2b 00 74 08 4c 89 e7 e8 cb RSP: 0018:ffffc90003f6f998 EFLAGS: 00010246 RAX: 000000000000004e RBX: dead000000000122 RCX: 01454d423f7fbf00 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: dffffc0000000000 R08: ffffffff819f077c R09: 1ffff920007eded0 R10: dffffc0000000000 R11: fffff520007eded1 R12: dead000000000122 R13: dffffc0000000000 R14: ffff8880352248d8 R15: ffff888021297e00 FS: 00007f7ace6686c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7aceeeb1d0 CR3: 000000003527c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __list_del_entry_valid include/linux/list.h:124 [inline] __list_del_entry include/linux/list.h:215 [inline] list_del_rcu include/linux/rculist.h:168 [inline] hci_chan_del+0x70/0x1b0 net/bluetooth/hci_conn.c:2858 l2cap_conn_free net/bluetooth/l2cap_core.c:1816 [inline] kref_put include/linux/kref.h:65 [inline] l2cap_conn_put+0x70/0xe0 net/bluetooth/l2cap_core.c:1830 l2cap_sock_shutdown+0xa8a/0x1020 net/bluetooth/l2cap_sock.c:1377 l2cap_sock_release+0x79/0x1d0 net/bluetooth/l2cap_sock.c:1416 __sock_release net/socket.c:642 [inline] sock_close+0xbc/0x240 net/socket.c:1393 __fput+0x3e9/0x9f0 fs/file_table.c:448 task_work_run+0x24f/0x310 kernel/task_work.c:227 ptrace_notify+0x2d2/0x380 kernel/signal.c:2522 ptrace_report_syscall include/linux/ptrace.h:415 [inline] ptrace_report_syscall_exit include/linux/ptrace.h:477 [inline] syscall_exit_work+0xc7/0x1d0 kernel/entry/common.c:173 syscall_exit_to_user_mode_prepare kernel/entry/common.c:200 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:205 [inline] syscall_exit_to_user_mode+0x24a/0x340 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7aceeaf449 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7ace668218 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: fffffffffffffffc RBX: 00007f7acef39328 RCX: 00007f7aceeaf449 RDX: 000000000000000e RSI: 0000000020000100 RDI: 0000000000000004 RBP: 00007f7acef39320 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 R13: 0000000000000004 R14: 00007f7ace668670 R15: 000000000000000b </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__list_del_entry_valid_or_report+0x12c/0x190 lib/list_debug.c:59 Code: 8c 4c 89 fe 48 89 da e8 32 8c 37 fc 90 0f 0b 48 89 df e8 27 9f 14 fd 48 c7 c7 a0 c0 60 8c 4c 89 fe 48 89 da e8 15 8c 37 fc 90 <0f> 0b 4c 89 e7 e8 0a 9f 14 fd 42 80 3c 2b 00 74 08 4c 89 e7 e8 cb RSP: 0018:ffffc90003f6f998 EFLAGS: 00010246 RAX: 000000000000004e RBX: dead000000000122 RCX: 01454d423f7fbf00 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: dffffc0000000000 R08: ffffffff819f077c R09: 1ffff920007eded0 R10: dffffc0000000000 R11: fffff520007eded1 R12: dead000000000122 R13: dffffc0000000000 R14: ffff8880352248d8 R15: ffff888021297e00 FS: 00007f7ace6686c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7acef05b08 CR3: 000000003527c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Reported-by: syzbot+10bd8fe6741eedd2be2e@syzkaller.appspotmail.com Tested-by: syzbot+10bd8fe6741eedd2be2e@syzkaller.appspotmail.com Fixes: b4f82f9ed43a ("Bluetooth: L2CAP: Fix slab-use-after-free Read in l2cap_send_cmd") Signed-off-by: Luiz Augusto von Dentz luiz.von.dentz@intel.com Signed-off-by: Dan Carpenter dan.carpenter@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- include/net/bluetooth/l2cap.h | 3 net/bluetooth/l2cap_core.c | 138 ++++++++++++++---------------------------- net/bluetooth/l2cap_sock.c | 15 ++-- 3 files changed, 58 insertions(+), 98 deletions(-)
--- a/include/net/bluetooth/l2cap.h +++ b/include/net/bluetooth/l2cap.h @@ -668,7 +668,7 @@ struct l2cap_conn { struct l2cap_chan *smp;
struct list_head chan_l; - struct mutex chan_lock; + struct mutex lock; struct kref ref; struct list_head users; }; @@ -970,6 +970,7 @@ void l2cap_chan_del(struct l2cap_chan *c void l2cap_send_conn_req(struct l2cap_chan *chan);
struct l2cap_conn *l2cap_conn_get(struct l2cap_conn *conn); +struct l2cap_conn *l2cap_conn_hold_unless_zero(struct l2cap_conn *conn); void l2cap_conn_put(struct l2cap_conn *conn);
int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user); --- a/net/bluetooth/l2cap_core.c +++ b/net/bluetooth/l2cap_core.c @@ -119,7 +119,6 @@ static struct l2cap_chan *l2cap_get_chan { struct l2cap_chan *c;
- mutex_lock(&conn->chan_lock); c = __l2cap_get_chan_by_scid(conn, cid); if (c) { /* Only lock if chan reference is not 0 */ @@ -127,7 +126,6 @@ static struct l2cap_chan *l2cap_get_chan if (c) l2cap_chan_lock(c); } - mutex_unlock(&conn->chan_lock);
return c; } @@ -140,7 +138,6 @@ static struct l2cap_chan *l2cap_get_chan { struct l2cap_chan *c;
- mutex_lock(&conn->chan_lock); c = __l2cap_get_chan_by_dcid(conn, cid); if (c) { /* Only lock if chan reference is not 0 */ @@ -148,7 +145,6 @@ static struct l2cap_chan *l2cap_get_chan if (c) l2cap_chan_lock(c); } - mutex_unlock(&conn->chan_lock);
return c; } @@ -418,7 +414,7 @@ static void l2cap_chan_timeout(struct wo if (!conn) return;
- mutex_lock(&conn->chan_lock); + mutex_lock(&conn->lock); /* __set_chan_timer() calls l2cap_chan_hold(chan) while scheduling * this work. No need to call l2cap_chan_hold(chan) here again. */ @@ -439,7 +435,7 @@ static void l2cap_chan_timeout(struct wo l2cap_chan_unlock(chan); l2cap_chan_put(chan);
- mutex_unlock(&conn->chan_lock); + mutex_unlock(&conn->lock); }
struct l2cap_chan *l2cap_chan_create(void) @@ -642,9 +638,9 @@ void __l2cap_chan_add(struct l2cap_conn
void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) { - mutex_lock(&conn->chan_lock); + mutex_lock(&conn->lock); __l2cap_chan_add(conn, chan); - mutex_unlock(&conn->chan_lock); + mutex_unlock(&conn->lock); }
void l2cap_chan_del(struct l2cap_chan *chan, int err) @@ -732,9 +728,9 @@ void l2cap_chan_list(struct l2cap_conn * if (!conn) return;
- mutex_lock(&conn->chan_lock); + mutex_lock(&conn->lock); __l2cap_chan_list(conn, func, data); - mutex_unlock(&conn->chan_lock); + mutex_unlock(&conn->lock); }
EXPORT_SYMBOL_GPL(l2cap_chan_list); @@ -746,7 +742,7 @@ static void l2cap_conn_update_id_addr(st struct hci_conn *hcon = conn->hcon; struct l2cap_chan *chan;
- mutex_lock(&conn->chan_lock); + mutex_lock(&conn->lock);
list_for_each_entry(chan, &conn->chan_l, list) { l2cap_chan_lock(chan); @@ -755,7 +751,7 @@ static void l2cap_conn_update_id_addr(st l2cap_chan_unlock(chan); }
- mutex_unlock(&conn->chan_lock); + mutex_unlock(&conn->lock); }
static void l2cap_chan_le_connect_reject(struct l2cap_chan *chan) @@ -1508,8 +1504,6 @@ static void l2cap_conn_start(struct l2ca
BT_DBG("conn %p", conn);
- mutex_lock(&conn->chan_lock); - list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { l2cap_chan_lock(chan);
@@ -1578,8 +1572,6 @@ static void l2cap_conn_start(struct l2ca
l2cap_chan_unlock(chan); } - - mutex_unlock(&conn->chan_lock); }
static void l2cap_le_conn_ready(struct l2cap_conn *conn) @@ -1625,7 +1617,7 @@ static void l2cap_conn_ready(struct l2ca if (hcon->type == ACL_LINK) l2cap_request_info(conn);
- mutex_lock(&conn->chan_lock); + mutex_lock(&conn->lock);
list_for_each_entry(chan, &conn->chan_l, list) {
@@ -1643,7 +1635,7 @@ static void l2cap_conn_ready(struct l2ca l2cap_chan_unlock(chan); }
- mutex_unlock(&conn->chan_lock); + mutex_unlock(&conn->lock);
if (hcon->type == LE_LINK) l2cap_le_conn_ready(conn); @@ -1658,14 +1650,10 @@ static void l2cap_conn_unreliable(struct
BT_DBG("conn %p", conn);
- mutex_lock(&conn->chan_lock); - list_for_each_entry(chan, &conn->chan_l, list) { if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) l2cap_chan_set_err(chan, err); } - - mutex_unlock(&conn->chan_lock); }
static void l2cap_info_timeout(struct work_struct *work) @@ -1676,7 +1664,9 @@ static void l2cap_info_timeout(struct wo conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; conn->info_ident = 0;
+ mutex_lock(&conn->lock); l2cap_conn_start(conn); + mutex_unlock(&conn->lock); }
/* @@ -1768,6 +1758,8 @@ static void l2cap_conn_del(struct hci_co
BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
+ mutex_lock(&conn->lock); + kfree_skb(conn->rx_skb);
skb_queue_purge(&conn->pending_rx); @@ -1786,8 +1778,6 @@ static void l2cap_conn_del(struct hci_co /* Force the connection to be immediately dropped */ hcon->disc_timeout = 0;
- mutex_lock(&conn->chan_lock); - /* Kill channels */ list_for_each_entry_safe(chan, l, &conn->chan_l, list) { l2cap_chan_hold(chan); @@ -1801,12 +1791,14 @@ static void l2cap_conn_del(struct hci_co l2cap_chan_put(chan); }
- mutex_unlock(&conn->chan_lock); - if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) cancel_delayed_work_sync(&conn->info_timer);
+ hci_chan_del(conn->hchan); + conn->hchan = NULL; + hcon->l2cap_data = NULL; + mutex_unlock(&conn->lock); l2cap_conn_put(conn); }
@@ -1814,7 +1806,6 @@ static void l2cap_conn_free(struct kref { struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref);
- hci_chan_del(conn->hchan); hci_conn_put(conn->hcon); kfree(conn); } @@ -2925,8 +2916,6 @@ static void l2cap_raw_recv(struct l2cap_
BT_DBG("conn %p", conn);
- mutex_lock(&conn->chan_lock); - list_for_each_entry(chan, &conn->chan_l, list) { if (chan->chan_type != L2CAP_CHAN_RAW) continue; @@ -2941,8 +2930,6 @@ static void l2cap_raw_recv(struct l2cap_ if (chan->ops->recv(chan, nskb)) kfree_skb(nskb); } - - mutex_unlock(&conn->chan_lock); }
/* ---- L2CAP signalling commands ---- */ @@ -3965,7 +3952,6 @@ static void l2cap_connect(struct l2cap_c goto response; }
- mutex_lock(&conn->chan_lock); l2cap_chan_lock(pchan);
/* Check if the ACL is secure enough (if not SDP) */ @@ -4072,7 +4058,6 @@ response: }
l2cap_chan_unlock(pchan); - mutex_unlock(&conn->chan_lock); l2cap_chan_put(pchan); }
@@ -4111,27 +4096,19 @@ static int l2cap_connect_create_rsp(stru BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status);
- mutex_lock(&conn->chan_lock); - if (scid) { chan = __l2cap_get_chan_by_scid(conn, scid); - if (!chan) { - err = -EBADSLT; - goto unlock; - } + if (!chan) + return -EBADSLT; } else { chan = __l2cap_get_chan_by_ident(conn, cmd->ident); - if (!chan) { - err = -EBADSLT; - goto unlock; - } + if (!chan) + return -EBADSLT; }
chan = l2cap_chan_hold_unless_zero(chan); - if (!chan) { - err = -EBADSLT; - goto unlock; - } + if (!chan) + return -EBADSLT;
err = 0;
@@ -4169,9 +4146,6 @@ static int l2cap_connect_create_rsp(stru l2cap_chan_unlock(chan); l2cap_chan_put(chan);
-unlock: - mutex_unlock(&conn->chan_lock); - return err; }
@@ -4459,11 +4433,7 @@ static inline int l2cap_disconnect_req(s
chan->ops->set_shutdown(chan);
- l2cap_chan_unlock(chan); - mutex_lock(&conn->chan_lock); - l2cap_chan_lock(chan); l2cap_chan_del(chan, ECONNRESET); - mutex_unlock(&conn->chan_lock);
chan->ops->close(chan);
@@ -4500,11 +4470,7 @@ static inline int l2cap_disconnect_rsp(s return 0; }
- l2cap_chan_unlock(chan); - mutex_lock(&conn->chan_lock); - l2cap_chan_lock(chan); l2cap_chan_del(chan, 0); - mutex_unlock(&conn->chan_lock);
chan->ops->close(chan);
@@ -4702,13 +4668,9 @@ static int l2cap_le_connect_rsp(struct l BT_DBG("dcid 0x%4.4x mtu %u mps %u credits %u result 0x%2.2x", dcid, mtu, mps, credits, result);
- mutex_lock(&conn->chan_lock); - chan = __l2cap_get_chan_by_ident(conn, cmd->ident); - if (!chan) { - err = -EBADSLT; - goto unlock; - } + if (!chan) + return -EBADSLT;
err = 0;
@@ -4756,9 +4718,6 @@ static int l2cap_le_connect_rsp(struct l
l2cap_chan_unlock(chan);
-unlock: - mutex_unlock(&conn->chan_lock); - return err; }
@@ -4870,7 +4829,6 @@ static int l2cap_le_connect_req(struct l goto response; }
- mutex_lock(&conn->chan_lock); l2cap_chan_lock(pchan);
if (!smp_sufficient_security(conn->hcon, pchan->sec_level, @@ -4936,7 +4894,6 @@ static int l2cap_le_connect_req(struct l
response_unlock: l2cap_chan_unlock(pchan); - mutex_unlock(&conn->chan_lock); l2cap_chan_put(pchan);
if (result == L2CAP_CR_PEND) @@ -5070,7 +5027,6 @@ static inline int l2cap_ecred_conn_req(s goto response; }
- mutex_lock(&conn->chan_lock); l2cap_chan_lock(pchan);
if (!smp_sufficient_security(conn->hcon, pchan->sec_level, @@ -5145,7 +5101,6 @@ static inline int l2cap_ecred_conn_req(s
unlock: l2cap_chan_unlock(pchan); - mutex_unlock(&conn->chan_lock); l2cap_chan_put(pchan);
response: @@ -5182,8 +5137,6 @@ static inline int l2cap_ecred_conn_rsp(s BT_DBG("mtu %u mps %u credits %u result 0x%4.4x", mtu, mps, credits, result);
- mutex_lock(&conn->chan_lock); - cmd_len -= sizeof(*rsp);
list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { @@ -5269,8 +5222,6 @@ static inline int l2cap_ecred_conn_rsp(s l2cap_chan_unlock(chan); }
- mutex_unlock(&conn->chan_lock); - return err; }
@@ -5383,8 +5334,6 @@ static inline int l2cap_le_command_rej(s if (cmd_len < sizeof(*rej)) return -EPROTO;
- mutex_lock(&conn->chan_lock); - chan = __l2cap_get_chan_by_ident(conn, cmd->ident); if (!chan) goto done; @@ -5399,7 +5348,6 @@ static inline int l2cap_le_command_rej(s l2cap_chan_put(chan);
done: - mutex_unlock(&conn->chan_lock); return 0; }
@@ -6854,8 +6802,12 @@ static void process_pending_rx(struct wo
BT_DBG("");
+ mutex_lock(&conn->lock); + while ((skb = skb_dequeue(&conn->pending_rx))) l2cap_recv_frame(conn, skb); + + mutex_unlock(&conn->lock); }
static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon) @@ -6894,7 +6846,7 @@ static struct l2cap_conn *l2cap_conn_add conn->local_fixed_chan |= L2CAP_FC_SMP_BREDR;
mutex_init(&conn->ident_lock); - mutex_init(&conn->chan_lock); + mutex_init(&conn->lock);
INIT_LIST_HEAD(&conn->chan_l); INIT_LIST_HEAD(&conn->users); @@ -7085,7 +7037,7 @@ int l2cap_chan_connect(struct l2cap_chan } }
- mutex_lock(&conn->chan_lock); + mutex_lock(&conn->lock); l2cap_chan_lock(chan);
if (cid && __l2cap_get_chan_by_dcid(conn, cid)) { @@ -7126,7 +7078,7 @@ int l2cap_chan_connect(struct l2cap_chan
chan_unlock: l2cap_chan_unlock(chan); - mutex_unlock(&conn->chan_lock); + mutex_unlock(&conn->lock); done: hci_dev_unlock(hdev); hci_dev_put(hdev); @@ -7339,7 +7291,7 @@ static void l2cap_security_cfm(struct hc
BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt);
- mutex_lock(&conn->chan_lock); + mutex_lock(&conn->lock);
list_for_each_entry(chan, &conn->chan_l, list) { l2cap_chan_lock(chan); @@ -7413,7 +7365,7 @@ static void l2cap_security_cfm(struct hc l2cap_chan_unlock(chan); }
- mutex_unlock(&conn->chan_lock); + mutex_unlock(&conn->lock); }
/* Append fragment into frame respecting the maximum len of rx_skb */ @@ -7480,8 +7432,11 @@ static void l2cap_recv_reset(struct l2ca conn->rx_len = 0; }
-static struct l2cap_conn *l2cap_conn_hold_unless_zero(struct l2cap_conn *c) +struct l2cap_conn *l2cap_conn_hold_unless_zero(struct l2cap_conn *c) { + if (!c) + return NULL; + BT_DBG("conn %p orig refcnt %u", c, kref_read(&c->ref));
if (!kref_get_unless_zero(&c->ref)) @@ -7507,11 +7462,15 @@ void l2cap_recv_acldata(struct hci_conn
hci_dev_unlock(hcon->hdev);
- if (!conn) - goto drop; + if (!conn) { + kfree_skb(skb); + return; + }
BT_DBG("conn %p len %u flags 0x%x", conn, skb->len, flags);
+ mutex_lock(&conn->lock); + switch (flags) { case ACL_START: case ACL_START_NO_FLUSH: @@ -7536,7 +7495,7 @@ void l2cap_recv_acldata(struct hci_conn if (len == skb->len) { /* Complete frame received */ l2cap_recv_frame(conn, skb); - return; + goto unlock; }
BT_DBG("Start: total len %d, frag len %u", len, skb->len); @@ -7598,10 +7557,11 @@ void l2cap_recv_acldata(struct hci_conn break; }
- l2cap_conn_put(conn); - drop: kfree_skb(skb); +unlock: + mutex_unlock(&conn->lock); + l2cap_conn_put(conn); }
static struct hci_cb l2cap_cb = { --- a/net/bluetooth/l2cap_sock.c +++ b/net/bluetooth/l2cap_sock.c @@ -1326,9 +1326,10 @@ static int l2cap_sock_shutdown(struct so /* prevent sk structure from being freed whilst unlocked */ sock_hold(sk);
- chan = l2cap_pi(sk)->chan; /* prevent chan structure from being freed whilst unlocked */ - l2cap_chan_hold(chan); + chan = l2cap_chan_hold_unless_zero(l2cap_pi(sk)->chan); + if (!chan) + goto shutdown_already;
BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
@@ -1358,22 +1359,20 @@ static int l2cap_sock_shutdown(struct so release_sock(sk);
l2cap_chan_lock(chan); - conn = chan->conn; - if (conn) - /* prevent conn structure from being freed */ - l2cap_conn_get(conn); + /* prevent conn structure from being freed */ + conn = l2cap_conn_hold_unless_zero(chan->conn); l2cap_chan_unlock(chan);
if (conn) /* mutex lock must be taken before l2cap_chan_lock() */ - mutex_lock(&conn->chan_lock); + mutex_lock(&conn->lock);
l2cap_chan_lock(chan); l2cap_chan_close(chan, 0); l2cap_chan_unlock(chan);
if (conn) { - mutex_unlock(&conn->chan_lock); + mutex_unlock(&conn->lock); l2cap_conn_put(conn); }