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| author |  Desmond Cheong Zhi Xi <desmondcheongzx@gmail.com>
| 2021-08-10 12:14:10 +0800 |
|---|---|---|
| committer |  Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
| 2021-08-10 10:40:48 -0700 |
| commit | e1dee2c1de2b4dd00eb44004a4bda6326ed07b59 (patch) | |
| tree | e207b7a041421fbd99d72b6cdc845f5eab4fafeb /net/bluetooth | |
| parent | Bluetooth: switch to lock_sock in RFCOMM (diff) | |
| download | linux-e1dee2c1de2b4dd00eb44004a4bda6326ed07b59.tar.gz linux-e1dee2c1de2b4dd00eb44004a4bda6326ed07b59.tar.bz2 linux-e1dee2c1de2b4dd00eb44004a4bda6326ed07b59.zip | |
Bluetooth: fix repeated calls to sco_sock_kill
In commit 4e1a720d0312 ("Bluetooth: avoid killing an already killed
socket"), a check was added to sco_sock_kill to skip killing a socket
if the SOCK_DEAD flag was set.
This was done after a trace for a use-after-free bug showed that the
same sock pointer was being killed twice.
Unfortunately, this check prevents sco_sock_kill from running on any
socket. sco_sock_kill kills a socket only if it's zapped and orphaned,
however sock_orphan announces that the socket is dead before detaching
it. i.e., orphaned sockets have the SOCK_DEAD flag set.
To fix this, we remove the check for SOCK_DEAD, and avoid repeated
calls to sco_sock_kill by removing incorrect calls in:
1. sco_sock_timeout. The socket should not be killed on timeout as
further processing is expected to be done. For example,
sco_sock_connect sets the timer then waits for the socket to be
connected or for an error to be returned.
2. sco_conn_del. This function should clean up resources for the
connection, but the socket itself should be cleaned up in
sco_sock_release.
3. sco_sock_close. Calls to sco_sock_close in sco_sock_cleanup_listen
and sco_sock_release are followed by sco_sock_kill. Hence the
duplicated call should be removed.
Fixes: 4e1a720d0312 ("Bluetooth: avoid killing an already killed socket")
Signed-off-by: Desmond Cheong Zhi Xi <desmondcheongzx@gmail.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Diffstat (limited to 'net/bluetooth')
| -rw-r--r-- | net/bluetooth/sco.c | 7 |
1 files changed, 1 insertions, 6 deletions
diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c index 77490338f4fa..98a881586512 100644 --- a/net/bluetooth/sco.c +++ b/net/bluetooth/sco.c @@ -97,8 +97,6 @@ static void sco_sock_timeout(struct work_struct *work) sk->sk_err = ETIMEDOUT; sk->sk_state_change(sk); release_sock(sk); - - sco_sock_kill(sk); sock_put(sk); } @@ -197,7 +195,6 @@ static void sco_conn_del(struct hci_conn *hcon, int err) sco_sock_clear_timer(sk); sco_chan_del(sk, err); release_sock(sk); - sco_sock_kill(sk); sock_put(sk); /* Ensure no more work items will run before freeing conn. */ @@ -404,8 +401,7 @@ static void sco_sock_cleanup_listen(struct sock *parent) */ static void sco_sock_kill(struct sock *sk) { - if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket || - sock_flag(sk, SOCK_DEAD)) + if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) return; BT_DBG("sk %p state %d", sk, sk->sk_state); @@ -457,7 +453,6 @@ static void sco_sock_close(struct sock *sk) sco_sock_clear_timer(sk); __sco_sock_close(sk); release_sock(sk); - sco_sock_kill(sk); } static void sco_skb_put_cmsg(struct sk_buff *skb, struct msghdr *msg, |