linux-kernel - [PATCH 3.16 019/202] packet: Do not leak dev refcounts on error exit

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Message-ID: <lsq.1556377989.83278858@decadent.org.uk>
Date:   Sat, 27 Apr 2019 16:13:09 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Leon Romanovsky" <leonro@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>,
        "Willem de Bruijn" <willemb@...gle.com>,
        "Jason Gunthorpe" <jgg@...lanox.com>
Subject: [PATCH 3.16 019/202] packet: Do not leak dev refcounts on error exit

3.16.66-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Jason Gunthorpe <jgg@...lanox.com>

commit d972f3dce8d161e2142da0ab1ef25df00e2f21a9 upstream.

'dev' is non NULL when the addr_len check triggers so it must goto a label
that does the dev_put otherwise dev will have a leaked refcount.

This bug causes the ib_ipoib module to become unloadable when using
systemd-network as it triggers this check on InfiniBand links.

Fixes: 99137b7888f4 ("packet: validate address length")
Reported-by: Leon Romanovsky <leonro@...lanox.com>
Signed-off-by: Jason Gunthorpe <jgg@...lanox.com>
Acked-by: Willem de Bruijn <willemb@...gle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/packet/af_packet.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -2302,7 +2302,7 @@ static int tpacket_snd(struct packet_soc
 		addr	= saddr->sll_halen ? saddr->sll_addr : NULL;
 		dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex);
 		if (addr && dev && saddr->sll_halen < dev->addr_len)
-			goto out;
+			goto out_put;
 	}
 
 	err = -ENXIO;
@@ -2464,7 +2464,7 @@ static int packet_snd(struct socket *soc
 		addr	= saddr->sll_halen ? saddr->sll_addr : NULL;
 		dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex);
 		if (addr && dev && saddr->sll_halen < dev->addr_len)
-			goto out;
+			goto out_unlock;
 	}
 
 	err = -ENXIO;