[PATCH 6/7] nfc: llcp: protect nfc_llcp_sock_unlink() calls

From: Krzysztof Kozlowski
Date: Sat Jan 15 2022 - 07:27:20 EST


nfc_llcp_sock_link() is called in all paths (bind/connect) as a last
action, still protected with lock_sock(). When cleaning up in
llcp_sock_release(), call nfc_llcp_sock_unlink() in a mirrored way:
earlier and still under the lock_sock().

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxx>
---
net/nfc/llcp_sock.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/net/nfc/llcp_sock.c b/net/nfc/llcp_sock.c
index c9d5c427f035..5c5705f5028b 100644
--- a/net/nfc/llcp_sock.c
+++ b/net/nfc/llcp_sock.c
@@ -631,6 +631,11 @@ static int llcp_sock_release(struct socket *sock)
}
}

+ if (sock->type == SOCK_RAW)
+ nfc_llcp_sock_unlink(&local->raw_sockets, sk);
+ else
+ nfc_llcp_sock_unlink(&local->sockets, sk);
+
if (llcp_sock->reserved_ssap < LLCP_SAP_MAX)
nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);

@@ -643,11 +648,6 @@ static int llcp_sock_release(struct socket *sock)
if (sk->sk_state == LLCP_DISCONNECTING)
return err;

- if (sock->type == SOCK_RAW)
- nfc_llcp_sock_unlink(&local->raw_sockets, sk);
- else
- nfc_llcp_sock_unlink(&local->sockets, sk);
-
out:
sock_orphan(sk);
sock_put(sk);
--
2.32.0