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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 <[email protected]>
Reported-by: 赵子轩 <[email protected]>
Reported-by: Stoyan Manolov <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>
This commit is contained in:
Eric Dumazet
2022-03-23 10:48:00 -07:00
committed by Jakub Kicinski
parent 2844e24343
commit 764f4eb684
1 changed files with 8 additions and 0 deletions
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net/llc/af_llc.c
+8
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@@ -311,6 +311,10 @@ 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_track(llc->dev, &llc->dev_tracker);
llc->dev = NULL;
}
return rc;
}
@@ -408,6 +412,10 @@ static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
out_put:
llc_sap_put(sap);
out:
if (rc) {
dev_put_track(llc->dev, &llc->dev_tracker);
llc->dev = NULL;
}
release_sock(sk);
return rc;
}