From: Antony Antony <antony.antony@xxxxxxxxxxx> [ Upstream commit 8dce43919566f06e865f7e8949f5c10d8c2493f5 ] xfrm interface if_id = 0 would cause xfrm policy lookup errors since Commit 9f8550e4bd9d. Now explicitly fail to create an xfrm interface when if_id = 0 With this commit: ip link add ipsec0 type xfrm dev lo if_id 0 Error: if_id must be non zero. v1->v2 change: - add Fixes: tag Fixes: 9f8550e4bd9d ("xfrm: fix disable_xfrm sysctl when used on xfrm interfaces") Signed-off-by: Antony Antony <antony.antony@xxxxxxxxxxx> Reviewed-by: Eyal Birger <eyal.birger@xxxxxxxxx> Signed-off-by: Steffen Klassert <steffen.klassert@xxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- net/xfrm/xfrm_interface.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/net/xfrm/xfrm_interface.c b/net/xfrm/xfrm_interface.c index 35a020a709852..054897358d904 100644 --- a/net/xfrm/xfrm_interface.c +++ b/net/xfrm/xfrm_interface.c @@ -662,11 +662,16 @@ static int xfrmi_newlink(struct net *src_net, struct net_device *dev, struct netlink_ext_ack *extack) { struct net *net = dev_net(dev); - struct xfrm_if_parms p; + struct xfrm_if_parms p = {}; struct xfrm_if *xi; int err; xfrmi_netlink_parms(data, &p); + if (!p.if_id) { + NL_SET_ERR_MSG(extack, "if_id must be non zero"); + return -EINVAL; + } + xi = xfrmi_locate(net, &p); if (xi) return -EEXIST; @@ -691,7 +696,12 @@ static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[], { struct xfrm_if *xi = netdev_priv(dev); struct net *net = xi->net; - struct xfrm_if_parms p; + struct xfrm_if_parms p = {}; + + if (!p.if_id) { + NL_SET_ERR_MSG(extack, "if_id must be non zero"); + return -EINVAL; + } xfrmi_netlink_parms(data, &p); xi = xfrmi_locate(net, &p); -- 2.34.1