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authorLuiz Augusto von Dentz <luiz.von.dentz@intel.com>2022-09-13 16:08:13 -0700
committerLuiz Augusto von Dentz <luiz.von.dentz@intel.com>2022-09-15 14:07:59 -0700
commit812e92b824c1db16c9519f8624d48a9901a0d38f (patch)
treea5348faefef4e12ff8cc766fc3a903463be0b36e
parent9afc675edeeb34d281675f1d5a217d27c5a1a3db (diff)
Bluetooth: RFCOMM: Fix possible deadlock on socket shutdown/release
Due to change to switch to use lock_sock inside rfcomm_sk_state_change the socket shutdown/release procedure can cause a deadlock: rfcomm_sock_shutdown(): lock_sock(); __rfcomm_sock_close(): rfcomm_dlc_close(): __rfcomm_dlc_close(): rfcomm_dlc_lock(); rfcomm_sk_state_change(): lock_sock(); To fix this when the call __rfcomm_sock_close is now done without holding the lock_sock since rfcomm_dlc_lock exists to protect the dlc data there is no need to use lock_sock in that code path. Link: https://lore.kernel.org/all/CAD+dNTsbuU4w+Y_P7o+VEN7BYCAbZuwZx2+tH+OTzCdcZF82YA@mail.gmail.com/ Fixes: b7ce436a5d79 ("Bluetooth: switch to lock_sock in RFCOMM") Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
-rw-r--r--net/bluetooth/rfcomm/sock.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c
index 4bf4ea6cbb5e..21e24da4847f 100644
--- a/net/bluetooth/rfcomm/sock.c
+++ b/net/bluetooth/rfcomm/sock.c
@@ -902,7 +902,10 @@ static int rfcomm_sock_shutdown(struct socket *sock, int how)
lock_sock(sk);
if (!sk->sk_shutdown) {
sk->sk_shutdown = SHUTDOWN_MASK;
+
+ release_sock(sk);
__rfcomm_sock_close(sk);
+ lock_sock(sk);
if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
!(current->flags & PF_EXITING))