From: Aaron Conole <aconole@bytheb.org>
Date: Sat, 2 Apr 2016 19:26:43 +0000 (-0400)
Subject: net/core/dev: Warn on a too-short GRO frame
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=4da46cebbd3b4dc445195a9672c99c1353af5695;p=linux-beck.git

net/core/dev: Warn on a too-short GRO frame

When signaling that a GRO frame is ready to be processed, the network stack
correctly checks length and aborts processing when a frame is less than 14
bytes. However, such a condition is really indicative of a broken driver,
and should be loudly signaled, rather than silently dropped as the case is
today.

Convert the condition to use net_warn_ratelimited() to ensure the stack
loudly complains about such broken drivers.

Signed-off-by: Aaron Conole <aconole@bytheb.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/core/dev.c b/net/core/dev.c
index b9bcbe77d913..273f10d1e306 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4663,6 +4663,8 @@ static struct sk_buff *napi_frags_skb(struct napi_struct *napi)
 	if (unlikely(skb_gro_header_hard(skb, hlen))) {
 		eth = skb_gro_header_slow(skb, hlen, 0);
 		if (unlikely(!eth)) {
+			net_warn_ratelimited("%s: dropping impossible skb from %s\n",
+					     __func__, napi->dev->name);
 			napi_reuse_skb(napi, skb);
 			return NULL;
 		}