[PATCH 6.6 016/166] Revert "Bluetooth: hci_core: Fix sleeping function called from invalid context"

19 Mar 2025

6.6-stable review patch.  If anyone has any objections, please let me know.
------------------
From: Luiz Augusto von Dentz luiz.von.dentz@intel.com
[ Upstream commit ab6ab707a4d060a51c45fc13e3b2228d5f7c0b87 ]
This reverts commit 4d94f05558271654670d18c26c912da0c1c15549 which has
problems (see [1]) and is no longer needed since 581dd2dc168f
("Bluetooth: hci_event: Fix using rcu_read_(un)lock while iterating")
has reworked the code where the original bug has been found.
[1] Link: https://lore.kernel.org/linux-bluetooth/877c55ci1r.wl-tiwai@suse.de/T/#t
Fixes: 4d94f0555827 ("Bluetooth: hci_core: Fix sleeping function called from invalid context")
Signed-off-by: Luiz Augusto von Dentz luiz.von.dentz@intel.com
Signed-off-by: Sasha Levin sashal@kernel.org
---
 include/net/bluetooth/hci_core.h | 108 +++++++++++--------------------
 net/bluetooth/hci_core.c         |  10 ++-
 net/bluetooth/iso.c              |   6 --
 net/bluetooth/l2cap_core.c       |  12 ++--
 net/bluetooth/rfcomm/core.c      |   6 --
 net/bluetooth/sco.c              |  12 ++--
 6 files changed, 57 insertions(+), 97 deletions(-)

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 4fcee6b734b74..e9214ccfde2d7 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -800,6 +800,7 @@ struct hci_conn_params {
 extern struct list_head hci_dev_list;
 extern struct list_head hci_cb_list;
 extern rwlock_t hci_dev_list_lock;
+extern struct mutex hci_cb_list_lock;
#define hci_dev_set_flag(hdev, nr)             set_bit((nr), (hdev)->dev_flags)
 #define hci_dev_clear_flag(hdev, nr)           clear_bit((nr), (hdev)->dev_flags)
@@ -1948,47 +1949,24 @@ struct hci_cb {
char *name;
-	bool (*match)		(struct hci_conn *conn);
    void (*connect_cfm)	(struct hci_conn *conn, __u8 status);
    void (*disconn_cfm)	(struct hci_conn *conn, __u8 status);
    void (*security_cfm)	(struct hci_conn *conn, __u8 status,
-				 __u8 encrypt);
+								__u8 encrypt);
    void (*key_change_cfm)	(struct hci_conn *conn, __u8 status);
    void (*role_switch_cfm)	(struct hci_conn *conn, __u8 status, __u8 role);
 };
-static inline void hci_cb_lookup(struct hci_conn *conn, struct list_head *list)
-{
-	struct hci_cb *cb, *cpy;
-
-	rcu_read_lock();
-	list_for_each_entry_rcu(cb, &hci_cb_list, list) {
-		if (cb->match && cb->match(conn)) {
-			cpy = kmalloc(sizeof(*cpy), GFP_ATOMIC);
-			if (!cpy)
-				break;
-
-			*cpy = *cb;
-			INIT_LIST_HEAD(&cpy->list);
-			list_add_rcu(&cpy->list, list);
-		}
-	}
-	rcu_read_unlock();
-}
-
 static inline void hci_connect_cfm(struct hci_conn *conn, __u8 status)
 {
-	struct list_head list;
-	struct hci_cb *cb, *tmp;
-
-	INIT_LIST_HEAD(&list);
-	hci_cb_lookup(conn, &list);
+	struct hci_cb *cb;
-	list_for_each_entry_safe(cb, tmp, &list, list) {
+	mutex_lock(&hci_cb_list_lock);
+	list_for_each_entry(cb, &hci_cb_list, list) {
    	if (cb->connect_cfm)
    		cb->connect_cfm(conn, status);
-		kfree(cb);
    }
+	mutex_unlock(&hci_cb_list_lock);
if (conn->connect_cfm_cb)
    	conn->connect_cfm_cb(conn, status);
@@ -1996,43 +1974,22 @@ static inline void hci_connect_cfm(struct hci_conn *conn, __u8 status)
static inline void hci_disconn_cfm(struct hci_conn *conn, __u8 reason)
 {
-	struct list_head list;
-	struct hci_cb *cb, *tmp;
-
-	INIT_LIST_HEAD(&list);
-	hci_cb_lookup(conn, &list);
+	struct hci_cb *cb;
-	list_for_each_entry_safe(cb, tmp, &list, list) {
+	mutex_lock(&hci_cb_list_lock);
+	list_for_each_entry(cb, &hci_cb_list, list) {
    	if (cb->disconn_cfm)
    		cb->disconn_cfm(conn, reason);
-		kfree(cb);
    }
+	mutex_unlock(&hci_cb_list_lock);
if (conn->disconn_cfm_cb)
    	conn->disconn_cfm_cb(conn, reason);
 }
-static inline void hci_security_cfm(struct hci_conn *conn, __u8 status,
-				    __u8 encrypt)
-{
-	struct list_head list;
-	struct hci_cb *cb, *tmp;
-
-	INIT_LIST_HEAD(&list);
-	hci_cb_lookup(conn, &list);
-
-	list_for_each_entry_safe(cb, tmp, &list, list) {
-		if (cb->security_cfm)
-			cb->security_cfm(conn, status, encrypt);
-		kfree(cb);
-	}
-
-	if (conn->security_cfm_cb)
-		conn->security_cfm_cb(conn, status);
-}
-
 static inline void hci_auth_cfm(struct hci_conn *conn, __u8 status)
 {
+	struct hci_cb *cb;
    __u8 encrypt;
if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
@@ -2040,11 +1997,20 @@ static inline void hci_auth_cfm(struct hci_conn *conn, __u8 status)
encrypt = test_bit(HCI_CONN_ENCRYPT, &conn->flags) ? 0x01 : 0x00;
-	hci_security_cfm(conn, status, encrypt);
+	mutex_lock(&hci_cb_list_lock);
+	list_for_each_entry(cb, &hci_cb_list, list) {
+		if (cb->security_cfm)
+			cb->security_cfm(conn, status, encrypt);
+	}
+	mutex_unlock(&hci_cb_list_lock);
+
+	if (conn->security_cfm_cb)
+		conn->security_cfm_cb(conn, status);
 }
static inline void hci_encrypt_cfm(struct hci_conn *conn, __u8 status)
 {
+	struct hci_cb *cb;
    __u8 encrypt;
if (conn->state == BT_CONFIG) {
@@ -2071,38 +2037,40 @@ static inline void hci_encrypt_cfm(struct hci_conn *conn, __u8 status)
    		conn->sec_level = conn->pending_sec_level;
    }
-	hci_security_cfm(conn, status, encrypt);
+	mutex_lock(&hci_cb_list_lock);
+	list_for_each_entry(cb, &hci_cb_list, list) {
+		if (cb->security_cfm)
+			cb->security_cfm(conn, status, encrypt);
+	}
+	mutex_unlock(&hci_cb_list_lock);
+
+	if (conn->security_cfm_cb)
+		conn->security_cfm_cb(conn, status);
 }
static inline void hci_key_change_cfm(struct hci_conn *conn, __u8 status)
 {
-	struct list_head list;
-	struct hci_cb *cb, *tmp;
-
-	INIT_LIST_HEAD(&list);
-	hci_cb_lookup(conn, &list);
+	struct hci_cb *cb;
-	list_for_each_entry_safe(cb, tmp, &list, list) {
+	mutex_lock(&hci_cb_list_lock);
+	list_for_each_entry(cb, &hci_cb_list, list) {
    	if (cb->key_change_cfm)
    		cb->key_change_cfm(conn, status);
-		kfree(cb);
    }
+	mutex_unlock(&hci_cb_list_lock);
 }
static inline void hci_role_switch_cfm(struct hci_conn *conn, __u8 status,
    							__u8 role)
 {
-	struct list_head list;
-	struct hci_cb *cb, *tmp;
-
-	INIT_LIST_HEAD(&list);
-	hci_cb_lookup(conn, &list);
+	struct hci_cb *cb;
-	list_for_each_entry_safe(cb, tmp, &list, list) {
+	mutex_lock(&hci_cb_list_lock);
+	list_for_each_entry(cb, &hci_cb_list, list) {
    	if (cb->role_switch_cfm)
    		cb->role_switch_cfm(conn, status, role);
-		kfree(cb);
    }
+	mutex_unlock(&hci_cb_list_lock);
 }
static inline bool hci_bdaddr_is_rpa(bdaddr_t *bdaddr, u8 addr_type)
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index f29fd32644011..30519d47e8a69 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -58,6 +58,7 @@ DEFINE_RWLOCK(hci_dev_list_lock);
/* HCI callback list */
 LIST_HEAD(hci_cb_list);
+DEFINE_MUTEX(hci_cb_list_lock);
/* HCI ID Numbering */
 static DEFINE_IDA(hci_index_ida);
@@ -2956,7 +2957,9 @@ int hci_register_cb(struct hci_cb *cb)
 {
    BT_DBG("%p name %s", cb, cb->name);
-	list_add_tail_rcu(&cb->list, &hci_cb_list);
+	mutex_lock(&hci_cb_list_lock);
+	list_add_tail(&cb->list, &hci_cb_list);
+	mutex_unlock(&hci_cb_list_lock);
return 0;
 }
@@ -2966,8 +2969,9 @@ int hci_unregister_cb(struct hci_cb *cb)
 {
    BT_DBG("%p name %s", cb, cb->name);
-	list_del_rcu(&cb->list);
-	synchronize_rcu();
+	mutex_lock(&hci_cb_list_lock);
+	list_del(&cb->list);
+	mutex_unlock(&hci_cb_list_lock);
return 0;
 }
diff --git a/net/bluetooth/iso.c b/net/bluetooth/iso.c
index f165cafa3aa98..b94d202bf3745 100644
--- a/net/bluetooth/iso.c
+++ b/net/bluetooth/iso.c
@@ -1929,11 +1929,6 @@ int iso_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 *flags)
    return lm;
 }
-static bool iso_match(struct hci_conn *hcon)
-{
-	return hcon->type == ISO_LINK || hcon->type == LE_LINK;
-}
-
 static void iso_connect_cfm(struct hci_conn *hcon, __u8 status)
 {
    if (hcon->type != ISO_LINK) {
@@ -2115,7 +2110,6 @@ void iso_recv(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
static struct hci_cb iso_cb = {
    .name		= "ISO",
-	.match		= iso_match,
    .connect_cfm	= iso_connect_cfm,
    .disconn_cfm	= iso_disconn_cfm,
 };
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 304ebb31cebba..76a85d8b17574 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -7228,11 +7228,6 @@ static struct l2cap_chan *l2cap_global_fixed_chan(struct l2cap_chan *c,
    return NULL;
 }
-static bool l2cap_match(struct hci_conn *hcon)
-{
-	return hcon->type == ACL_LINK || hcon->type == LE_LINK;
-}
-
 static void l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
 {
    struct hci_dev *hdev = hcon->hdev;
@@ -7240,6 +7235,9 @@ static void l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
    struct l2cap_chan *pchan;
    u8 dst_type;
+	if (hcon->type != ACL_LINK && hcon->type != LE_LINK)
+		return;
+
    BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
if (status) {
@@ -7304,6 +7302,9 @@ int l2cap_disconn_ind(struct hci_conn *hcon)
static void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
 {
+	if (hcon->type != ACL_LINK && hcon->type != LE_LINK)
+		return;
+
    BT_DBG("hcon %p reason %d", hcon, reason);
l2cap_conn_del(hcon, bt_to_errno(reason));
@@ -7582,7 +7583,6 @@ void l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
static struct hci_cb l2cap_cb = {
    .name		= "L2CAP",
-	.match		= l2cap_match,
    .connect_cfm	= l2cap_connect_cfm,
    .disconn_cfm	= l2cap_disconn_cfm,
    .security_cfm	= l2cap_security_cfm,
diff --git a/net/bluetooth/rfcomm/core.c b/net/bluetooth/rfcomm/core.c
index 9d46afb24caf0..1d34d84970332 100644
--- a/net/bluetooth/rfcomm/core.c
+++ b/net/bluetooth/rfcomm/core.c
@@ -2134,11 +2134,6 @@ static int rfcomm_run(void *unused)
    return 0;
 }
-static bool rfcomm_match(struct hci_conn *hcon)
-{
-	return hcon->type == ACL_LINK;
-}
-
 static void rfcomm_security_cfm(struct hci_conn *conn, u8 status, u8 encrypt)
 {
    struct rfcomm_session *s;
@@ -2185,7 +2180,6 @@ static void rfcomm_security_cfm(struct hci_conn *conn, u8 status, u8 encrypt)
static struct hci_cb rfcomm_cb = {
    .name		= "RFCOMM",
-	.match		= rfcomm_match,
    .security_cfm	= rfcomm_security_cfm
 };
diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index c4c36ff25fb20..64d4d57c7033a 100644
--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -1353,13 +1353,11 @@ int sco_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 *flags)
    return lm;
 }
-static bool sco_match(struct hci_conn *hcon)
-{
-	return hcon->type == SCO_LINK || hcon->type == ESCO_LINK;
-}
-
 static void sco_connect_cfm(struct hci_conn *hcon, __u8 status)
 {
+	if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK)
+		return;
+
    BT_DBG("hcon %p bdaddr %pMR status %u", hcon, &hcon->dst, status);
if (!status) {
@@ -1374,6 +1372,9 @@ static void sco_connect_cfm(struct hci_conn *hcon, __u8 status)
static void sco_disconn_cfm(struct hci_conn *hcon, __u8 reason)
 {
+	if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK)
+		return;
+
    BT_DBG("hcon %p reason %d", hcon, reason);
sco_conn_del(hcon, bt_to_errno(reason));
@@ -1399,7 +1400,6 @@ void sco_recv_scodata(struct hci_conn *hcon, struct sk_buff *skb)
static struct hci_cb sco_cb = {
    .name		= "SCO",
-	.match		= sco_match,
    .connect_cfm	= sco_connect_cfm,
    .disconn_cfm	= sco_disconn_cfm,
 };
-- 
2.39.5





    

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[PATCH 6.6 016/166] Revert "Bluetooth: hci_core: Fix sleeping function called from invalid context"