Messages in this thread | | | Date | Sat, 27 May 2023 14:59:04 +0200 | From | Simon Horman <> | Subject | Re: [PATCH] Bluetooth: L2CAP: Fix use-after-free in l2cap_sock_ready_cb |
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On Fri, May 26, 2023 at 02:16:48PM -0400, Sungwoo Kim wrote: > > net/bluetooth/l2cap_sock.c: In function 'l2cap_sock_release': > > >> net/bluetooth/l2cap_sock.c:1418:9: error: implicit declaration of function 'l2cap_sock_cleanup_listen'; did you mean 'l2cap_sock_listen'? [-Werror=implicit-function-declaration] > > Fix this error > > > 1418 | l2cap_sock_cleanup_listen(sk); > > | ^~~~~~~~~~~~~~~~~~~~~~~~~ > > | l2cap_sock_listen > > net/bluetooth/l2cap_sock.c: At top level: > > >> net/bluetooth/l2cap_sock.c:1436:13: warning: conflicting types for 'l2cap_sock_cleanup_listen'; have 'void(struct sock *)' > > 1436 | static void l2cap_sock_cleanup_listen(struct sock *parent) > > | ^~~~~~~~~~~~~~~~~~~~~~~~~ > > >> net/bluetooth/l2cap_sock.c:1436:13: error: static declaration of 'l2cap_sock_cleanup_listen' follows non-static declaration > > net/bluetooth/l2cap_sock.c:1418:9: note: previous implicit declaration of 'l2cap_sock_cleanup_listen' with type 'void(struct sock *)' > > 1418 | l2cap_sock_cleanup_listen(sk); > > | ^~~~~~~~~~~~~~~~~~~~~~~~~ > > cc1: some warnings being treated as errors > > Signed-off-by: Sungwoo Kim <iam@sung-woo.kim>
Hi,
I am confused about why this error occurs. In bluetooth-next [1] I see that l2cap_sock_cleanup_listen() is defined on line 1435 of l2cap_sock.c. And then used on line 1574. So there should be no need for a forward declaration.
[1] a088d769ef3a ("Bluetooth: L2CAP: Fix use-after-free")
> --- > net/bluetooth/l2cap_sock.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c > index eebe25610..3818e11a8 100644 > --- a/net/bluetooth/l2cap_sock.c > +++ b/net/bluetooth/l2cap_sock.c > @@ -46,6 +46,7 @@ static const struct proto_ops l2cap_sock_ops; > static void l2cap_sock_init(struct sock *sk, struct sock *parent); > static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, > int proto, gfp_t prio, int kern); > +static void l2cap_sock_cleanup_listen(struct sock *parent); > > bool l2cap_is_socket(struct socket *sock) > { > @@ -1414,7 +1415,8 @@ static int l2cap_sock_release(struct socket *sock) > > if (!sk) > return 0; > - > +
nit: The white-space on the line above was correct (no white-space) Now there are trailing tabs.
> + l2cap_sock_cleanup_listen(sk);
This change may match the patch subject but seems unrelated to the patch description.
> bt_sock_unlink(&l2cap_sk_list, sk); > > err = l2cap_sock_shutdown(sock, SHUT_RDWR); > -- > 2.34.1 > >
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