net: ip_gre: Accept IFLA_INFO_DATA-less configuration

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: e1f8f78ffe98 ("net: ip_gre: Separate ERSPAN newlink / changelink callbacks")
Signed-off-by: Petr Machata <>
Signed-off-by: David S. Miller <>
1 file changed