--- /dev/null
+From 8d271d77834f96bd04ff3a29eb688d4364eec009 Mon Sep 17 00:00:00 2001
+From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+Date: Mon, 9 Oct 2023 20:25:00 +0200
+Subject: Revert "rtnetlink: Reject negative ifindexes in RTM_NEWLINK"
+
+From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+
+This reverts commit 69197b2b2a7bcf92b209490639316af5dc751cc0 which is
+commit 30188bd7838c16a98a520db1fe9df01ffc6ed368 upstream.
+
+It was improperly backported to 4.14.y, and applied to the wrong
+function, which obviously causes problems. A fixed version will be
+applied as a separate commit later.
+
+Reported-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
+Link: https://lore.kernel.org/r/ZSQeA8fhUT++iZvz@ostr-mac
+Cc: Ido Schimmel <idosch@nvidia.com>
+Cc: Jiri Pirko <jiri@nvidia.com>
+Cc: Jakub Kicinski <kuba@kernel.org>
+Cc: Paolo Abeni <pabeni@redhat.com>
+Cc: Sasha Levin <sashal@kernel.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ net/core/rtnetlink.c | 5 +----
+ 1 file changed, 1 insertion(+), 4 deletions(-)
+
+--- a/net/core/rtnetlink.c
++++ b/net/core/rtnetlink.c
+@@ -2311,10 +2311,7 @@ static int rtnl_setlink(struct sk_buff *
+ ifm = nlmsg_data(nlh);
+ if (ifm->ifi_index > 0)
+ dev = __dev_get_by_index(net, ifm->ifi_index);
+- else if (ifm->ifi_index < 0) {
+- NL_SET_ERR_MSG(extack, "ifindex can't be negative");
+- return -EINVAL;
+- } else if (tb[IFLA_IFNAME])
++ else if (tb[IFLA_IFNAME])
+ dev = __dev_get_by_name(net, ifname);
+ else
+ goto errout;