net: remove WARN_ON_ONCE when accessing forward path array

[ Upstream commit 008e7a7 ]

Although unlikely, recent support for IPIP tunnels increases chances of
reaching this WARN_ON_ONCE if userspace manages to build a sufficiently
long forward path.

Remove it.

Fixes: ddb94ea ("net: resolve forwarding path from virtual netdevice and HW destination address")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: ummakynes

net/core/dev.c

@@ -695,7 +695,7 @@ static struct net_device_path *dev_fwd_path(struct net_device_path_stack *stack)
 {
 	int k = stack->num_paths++;
 
-	if (WARN_ON_ONCE(k >= NET_DEVICE_PATH_STACK_MAX))
+	if (k >= NET_DEVICE_PATH_STACK_MAX)
 		return NULL;
 
 	return &stack->path[k];