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llc: fix netdevice reference leaks in llc_ui_bind()

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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>
This commit is contained in:
Eric Dumazet 2022-03-22 17:41:47 -07:00 • committed by Jakub Kicinski
parent 2844e24343
commit 764f4eb684
1 changed files with 8 additions and 0 deletions
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8
net/llc/af_llc.c
View file

@ -311,6 +311,10 @@ static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr)
sock_reset_flag(sk, SOCK_ZAPPED); sock_reset_flag(sk, SOCK_ZAPPED);
rc = 0; rc = 0;
out: out:
if (rc) {
dev_put_track(llc->dev, &llc->dev_tracker);
llc->dev = NULL;
}
return rc; return rc;
} }
@ -408,6 +412,10 @@ static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
out_put: out_put:
llc_sap_put(sap); llc_sap_put(sap);
out: out:
if (rc) {
dev_put_track(llc->dev, &llc->dev_tracker);
llc->dev = NULL;
}
release_sock(sk); release_sock(sk);
return rc; return rc;
} }