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authorFernando Luis Vazquez Cao <fernando_b1@lab.ntt.co.jp>2014-02-04 19:35:02 +0900
committerDavid S. Miller <davem@davemloft.net>2014-02-04 20:28:51 -0800
commit6049f2530cf2cb48a6fe8735309cc0b97aa7f700 (patch)
treea07a96a5e642ab74da65617e3558da287949d1cf /net
parent61950e82b384cbe581f7e9cb668f77dc1d8cef35 (diff)
downloadlinux-stericsson-6049f2530cf2cb48a6fe8735309cc0b97aa7f700.tar.gz
rtnetlink: fix oops in rtnl_link_get_slave_info_data_size
We should check whether rtnetlink link operations are defined before calling get_slave_size(). Without this, the following oops can occur when adding a tap device to OVS. [ 87.839553] BUG: unable to handle kernel NULL pointer dereference at 00000000000000a8 [ 87.839595] IP: [<ffffffff813d47c0>] if_nlmsg_size+0xf0/0x220 [...] [ 87.840651] Call Trace: [ 87.840664] [<ffffffff813d694b>] ? rtmsg_ifinfo+0x2b/0x100 [ 87.840688] [<ffffffff813c8340>] ? __netdev_adjacent_dev_insert+0x150/0x1a0 [ 87.840718] [<ffffffff813d6a50>] ? rtnetlink_event+0x30/0x40 [ 87.840742] [<ffffffff814b4144>] ? notifier_call_chain+0x44/0x70 [ 87.840768] [<ffffffff813c8946>] ? __netdev_upper_dev_link+0x3c6/0x3f0 [ 87.840798] [<ffffffffa0678d6c>] ? netdev_create+0xcc/0x160 [openvswitch] [ 87.840828] [<ffffffffa06781ea>] ? ovs_vport_add+0x4a/0xd0 [openvswitch] [ 87.840857] [<ffffffffa0670139>] ? new_vport+0x9/0x50 [openvswitch] [ 87.840884] [<ffffffffa067279e>] ? ovs_vport_cmd_new+0x11e/0x210 [openvswitch] [ 87.840915] [<ffffffff813f3efa>] ? genl_family_rcv_msg+0x19a/0x360 [ 87.840941] [<ffffffff813f40c0>] ? genl_family_rcv_msg+0x360/0x360 [ 87.840967] [<ffffffff813f4139>] ? genl_rcv_msg+0x79/0xc0 [ 87.840991] [<ffffffff813b6cf9>] ? __kmalloc_reserve.isra.25+0x29/0x80 [ 87.841018] [<ffffffff813f2389>] ? netlink_rcv_skb+0xa9/0xc0 [ 87.841042] [<ffffffff813f27cf>] ? genl_rcv+0x1f/0x30 [ 87.841064] [<ffffffff813f1988>] ? netlink_unicast+0xe8/0x1e0 [ 87.841088] [<ffffffff813f1d9a>] ? netlink_sendmsg+0x31a/0x750 [ 87.841113] [<ffffffff813aee96>] ? sock_sendmsg+0x86/0xc0 [ 87.841136] [<ffffffff813c960d>] ? __netdev_update_features+0x4d/0x200 [ 87.841163] [<ffffffff813ca94e>] ? ethtool_get_value+0x2e/0x50 [ 87.841188] [<ffffffff813af269>] ? ___sys_sendmsg+0x359/0x370 [ 87.841212] [<ffffffff813da686>] ? dev_ioctl+0x1a6/0x5c0 [ 87.841236] [<ffffffff8109c210>] ? autoremove_wake_function+0x30/0x30 [ 87.841264] [<ffffffff813ac59d>] ? sock_do_ioctl+0x3d/0x50 [ 87.841288] [<ffffffff813aca68>] ? sock_ioctl+0x1e8/0x2c0 [ 87.841312] [<ffffffff811934bf>] ? do_vfs_ioctl+0x2cf/0x4b0 [ 87.841335] [<ffffffff813afeb9>] ? __sys_sendmsg+0x39/0x70 [ 87.841362] [<ffffffff814b86f9>] ? system_call_fastpath+0x16/0x1b [ 87.841386] Code: c0 74 10 48 89 ef ff d0 83 c0 07 83 e0 fc 48 98 49 01 c7 48 89 ef e8 d0 d6 fe ff 48 85 c0 0f 84 df 00 00 00 48 8b 90 08 07 00 00 <48> 8b 8a a8 00 00 00 31 d2 48 85 c9 74 0c 48 89 ee 48 89 c7 ff [ 87.841529] RIP [<ffffffff813d47c0>] if_nlmsg_size+0xf0/0x220 [ 87.841555] RSP <ffff880221aa5950> [ 87.841569] CR2: 00000000000000a8 [ 87.851442] ---[ end trace e42ab217691b4fc2 ]--- Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp> Acked-by: Jiri Pirko <jiri@resnulli.us> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/rtnetlink.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 393b1bc9a618..048dc8d183aa 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -374,7 +374,7 @@ static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
if (!master_dev)
return 0;
ops = master_dev->rtnl_link_ops;
- if (!ops->get_slave_size)
+ if (!ops || !ops->get_slave_size)
return 0;
/* IFLA_INFO_SLAVE_DATA + nested data */
return nla_total_size(sizeof(struct nlattr)) +