net: ip_gre: Accept IFLA_INFO_DATA-less configuration
[ Upstream commit 32ca98fe ] 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: e1f8f78f ("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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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8df09014
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