rtnetlink: add the missing IFLA_GRO_ tb check in validate_linkmsg

This fixes the issue that dev gro_max_size and gso_ipv4_max_size
can be set to a huge value:

  # ip link add dummy1 type dummy
  # ip link set dummy1 gro_max_size 4294967295
  # ip -d link show dummy1
    dummy addrgenmode eui64 ... gro_max_size 4294967295

Fixes: 0fe79f28bfaf ("net: allow gro_max_size to exceed 65536")
Fixes: 9eefedd58ae1 ("net: add gso_ipv4_max_size and gro_ipv4_max_size per device")
Reported-by: Xiumei Mu <xmu@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index bc068a8..41de3a2 100644 (file)
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2399,11 +2399,23 @@ static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[],
                        return -EINVAL;
                }
 
+               if (tb[IFLA_GRO_MAX_SIZE] &&
+                   nla_get_u32(tb[IFLA_GRO_MAX_SIZE]) > GRO_MAX_SIZE) {
+                       NL_SET_ERR_MSG(extack, "too big gro_max_size");
+                       return -EINVAL;
+               }
+
                if (tb[IFLA_GSO_IPV4_MAX_SIZE] &&
                    nla_get_u32(tb[IFLA_GSO_IPV4_MAX_SIZE]) > dev->tso_max_size) {
                        NL_SET_ERR_MSG(extack, "too big gso_ipv4_max_size");
                        return -EINVAL;
                }
+
+               if (tb[IFLA_GRO_IPV4_MAX_SIZE] &&
+                   nla_get_u32(tb[IFLA_GRO_IPV4_MAX_SIZE]) > GRO_MAX_SIZE) {
+                       NL_SET_ERR_MSG(extack, "too big gro_ipv4_max_size");
+                       return -EINVAL;
+               }
        }
 
        if (tb[IFLA_AF_SPEC]) {