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llc: fix netdevice reference leaks in llc_ui_bind() 

commit 764f4eb684 upstream.

Whenever llc_ui_bind() and/or llc_ui_autobind()
took a reference on a netdevice but subsequently fail,
they must properly release their reference
or risk the infamous message from unregister_netdevice()
at device dismantle.

unregister_netdevice: waiting for eth0 to become free. Usage count = 3

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: 赵子轩 <beraphin@gmail.com>
Reported-by: Stoyan Manolov <smanolov@suse.de>
Link: https://lore.kernel.org/r/20220323004147.1990845-1-eric.dumazet@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Fuhai Wang <fuhaiwang@tencent.com>
This commit is contained in:
Eric Dumazet 2022-03-22 17:41:47 -07:00 committed by Jianping Liu
parent 3e0050dfee
commit 87690358f7
1 changed files with 8 additions and 0 deletions
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8
net/llc/af_llc.c
View File

@ -303,6 +303,10 @@ static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr)
sock_reset_flag(sk, SOCK_ZAPPED);
rc = 0;
out:
if (rc) {
dev_put(llc->dev);
llc->dev = NULL;
}
return rc;
}
@ -401,6 +405,10 @@ static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
out_put:
llc_sap_put(sap);
out:
if (rc) {
dev_put(llc->dev);
llc->dev = NULL;
}
release_sock(sk);
return rc;
}