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net: ip_gre: Accept IFLA_INFO_DATA-less configuration

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The fix referenced below causes a crash when an ERSPAN tunnel is created
without passing IFLA_INFO_DATA. Fix by validating passed-in data in the
same way as ipgre does.

Fixes: e1f8f78ffe ("net: ip_gre: Separate ERSPAN newlink / changelink callbacks")
Reported-by: syzbot+1b4ebf4dae4e510dd219@syzkaller.appspotmail.com
Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Petr Machata 2020-03-16 19:53:00 +02:00 committed by David S. Miller
parent 065fd83e1b
commit 32ca98feab
1 changed files with 2 additions and 0 deletions
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net/ipv4/ip_gre.c
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@ -1168,6 +1168,8 @@ static int erspan_netlink_parms(struct net_device *dev,
err = ipgre_netlink_parms(dev, data, tb, parms, fwmark);
if (err)
return err;
if (!data)
return 0;
if (data[IFLA_GRE_ERSPAN_VER]) {
t->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);