diff options
authorLinus Torvalds <torvalds@linux-foundation.org>2015-07-04 19:11:33 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-07-04 19:11:33 -0700
commit9b284cbdb5de3b8871014f8290d1b540e5181c21 (patch)
parent5c755fe142b421d295e7dd64a9833c12abbfd28e (diff)
bluetooth: fix list handling
Commit 835a6a2f8603 ("Bluetooth: Stop sabotaging list poisoning") thought that the code was sabotaging the list poisoning when NULL'ing out the list pointers and removed it. But what was going on was that the bluetooth code was using NULL pointers for the list as a way to mark it empty, and that commit just broke it (and replaced the test with NULL with a "list_empty()" test on a uninitialized list instead, breaking things even further). So fix it all up to use the regular and real list_empty() handling (which does not use NULL, but a pointer to itself), also making sure to initialize the list properly (the previous NULL case was initialized implicitly by the session being allocated with kzalloc()) This is a combination of patches by Marcel Holtmann and Tedd Ho-Jeong An. [ I would normally expect to get this through the bt tree, but I'm going to release -rc1, so I'm just committing this directly - Linus ] Reported-and-tested-by: Jörg Otte <jrg.otte@gmail.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Original-by: Tedd Ho-Jeong An <tedd.an@intel.com> Original-by: Marcel Holtmann <marcel@holtmann.org>: Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2 files changed, 3 insertions, 2 deletions
diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
index 9070dfd6b4ad..f1a117f8cad2 100644
--- a/net/bluetooth/hidp/core.c
+++ b/net/bluetooth/hidp/core.c
@@ -915,6 +915,7 @@ static int hidp_session_new(struct hidp_session **out, const bdaddr_t *bdaddr,
session->conn = l2cap_conn_get(conn);
session->user.probe = hidp_session_probe;
session->user.remove = hidp_session_remove;
+ INIT_LIST_HEAD(&session->user.list);
session->ctrl_sock = ctrl_sock;
session->intr_sock = intr_sock;
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 51594fb7b9e7..45fffa413642 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -1634,7 +1634,7 @@ void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user)
if (list_empty(&user->list))
goto out_unlock;
- list_del(&user->list);
+ list_del_init(&user->list);
user->remove(conn, user);
@@ -1648,7 +1648,7 @@ static void l2cap_unregister_all_users(struct l2cap_conn *conn)
while (!list_empty(&conn->users)) {
user = list_first_entry(&conn->users, struct l2cap_user, list);
- list_del(&user->list);
+ list_del_init(&user->list);
user->remove(conn, user);