diff options
| author | Thomas Graf <tgraf@suug.ch> | 2014-11-26 13:42:20 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-11-26 15:29:01 -0500 |
| commit | aa68c20ff32f9a6fb3ca7f93ed9beae01899d00d (patch) | |
| tree | 92ea43345e093ad57f1068a52577428be4b45e9f | |
| parent | 6f705d8cfc0af3607aed890c53d86255e315c6f4 (diff) | |
bridge: Sanitize IFLA_EXT_MASK for AF_BRIDGE:RTM_GETLINK
Only search for IFLA_EXT_MASK if the message actually carries a
ifinfomsg header and validate minimal length requirements for
IFLA_EXT_MASK.
Fixes: 6cbdceeb ("bridge: Dump vlan information from a bridge port")
Cc: Vlad Yasevich <vyasevic@redhat.com>
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/core/rtnetlink.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index 5a853f8fad6c..b9b7dfaf202b 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -2685,13 +2685,20 @@ static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb) int idx = 0; u32 portid = NETLINK_CB(cb->skb).portid; u32 seq = cb->nlh->nlmsg_seq; - struct nlattr *extfilt; u32 filter_mask = 0; - extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg), - IFLA_EXT_MASK); - if (extfilt) - filter_mask = nla_get_u32(extfilt); + if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) { + struct nlattr *extfilt; + + extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg), + IFLA_EXT_MASK); + if (extfilt) { + if (nla_len(extfilt) < sizeof(filter_mask)) + return -EINVAL; + + filter_mask = nla_get_u32(extfilt); + } + } rcu_read_lock(); for_each_netdev_rcu(net, dev) { |