From a718dcc5e56546a62d00f57cc875faac2f42c8bf Mon Sep 17 00:00:00 2001 From: Arvid Brodin Date: Fri, 4 Jul 2014 23:42:00 +0200 Subject: [PATCH] net/hsr: Fix NULL pointer dereference on incomplete hsr_newlink() params. If none of the slave interfaces are specified, struct nlattr *data[] may be NULL. Make sure to check for that. While I'm at it, fix the horrible error messages displayed when only one of the slave interfaces isn't specified. Signed-off-by: Arvid Brodin Signed-off-by: David S. Miller --- net/hsr/hsr_netlink.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/net/hsr/hsr_netlink.c b/net/hsr/hsr_netlink.c index fbdf53f1d874..a2c7e4c0ac1e 100644 --- a/net/hsr/hsr_netlink.c +++ b/net/hsr/hsr_netlink.c @@ -37,13 +37,17 @@ static int hsr_newlink(struct net *src_net, struct net_device *dev, struct net_device *link[2]; unsigned char multicast_spec; + if (!data) { + netdev_info(dev, "HSR: No slave devices specified\n"); + return -EINVAL; + } if (!data[IFLA_HSR_SLAVE1]) { - netdev_info(dev, "IFLA_HSR_SLAVE1 missing!\n"); + netdev_info(dev, "HSR: Slave1 device not specified\n"); return -EINVAL; } link[0] = __dev_get_by_index(src_net, nla_get_u32(data[IFLA_HSR_SLAVE1])); if (!data[IFLA_HSR_SLAVE2]) { - netdev_info(dev, "IFLA_HSR_SLAVE2 missing!\n"); + netdev_info(dev, "HSR: Slave2 device not specified\n"); return -EINVAL; } link[1] = __dev_get_by_index(src_net, nla_get_u32(data[IFLA_HSR_SLAVE2])); -- 2.20.1