Commit 8fc29ff3 authored by Cong Wang's avatar Cong Wang Committed by Jakub Kicinski

kcm: fix strp_init() order and cleanup

strp_init() is called just a few lines above this csk->sk_user_data
check, it also initializes strp->work etc., therefore, it is
unnecessary to call strp_done() to cancel the freshly initialized
work.

And if sk_user_data is already used by KCM, psock->strp should not be
touched, particularly strp->work state, so we need to move strp_init()
after the csk->sk_user_data check.

This also makes a lockdep warning reported by syzbot go away.

Reported-and-tested-by: syzbot+9fc084a4348493ef65d2@syzkaller.appspotmail.com
Reported-by: syzbot+e696806ef96cdd2d87cd@syzkaller.appspotmail.com
Fixes: e5571240 ("kcm: Check if sk_user_data already set in kcm_attach")
Fixes: dff8baa2 ("kcm: Call strp_stop before strp_done in kcm_attach")
Cc: Tom Herbert <tom@herbertland.com>
Signed-off-by: default avatarCong Wang <cong.wang@bytedance.com>
Link: https://lore.kernel.org/r/20220827181314.193710-1-xiyou.wangcong@gmail.comSigned-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 3a1a274e
......@@ -1412,12 +1412,6 @@ static int kcm_attach(struct socket *sock, struct socket *csock,
psock->sk = csk;
psock->bpf_prog = prog;
err = strp_init(&psock->strp, csk, &cb);
if (err) {
kmem_cache_free(kcm_psockp, psock);
goto out;
}
write_lock_bh(&csk->sk_callback_lock);
/* Check if sk_user_data is already by KCM or someone else.
......@@ -1425,13 +1419,18 @@ static int kcm_attach(struct socket *sock, struct socket *csock,
*/
if (csk->sk_user_data) {
write_unlock_bh(&csk->sk_callback_lock);
strp_stop(&psock->strp);
strp_done(&psock->strp);
kmem_cache_free(kcm_psockp, psock);
err = -EALREADY;
goto out;
}
err = strp_init(&psock->strp, csk, &cb);
if (err) {
write_unlock_bh(&csk->sk_callback_lock);
kmem_cache_free(kcm_psockp, psock);
goto out;
}
psock->save_data_ready = csk->sk_data_ready;
psock->save_write_space = csk->sk_write_space;
psock->save_state_change = csk->sk_state_change;
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment