4.20-stable review patch. If anyone has any objections, please let me know.
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From: Jason Gunthorpe jgg@mellanox.com
[ Upstream commit d972f3dce8d161e2142da0ab1ef25df00e2f21a9 ]
'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@mellanox.com Signed-off-by: Jason Gunthorpe jgg@mellanox.com Acked-by: Willem de Bruijn willemb@google.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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 @@ -2628,7 +2628,7 @@ 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; @@ -2828,7 +2828,7 @@ 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;