From 761ee09e9f5da07167e31db58fbd6564cdf708b8 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1@gmail.com>
Date: Sat, 21 Nov 2020 00:22:20 +0100
Subject: [PATCH] net: warn if gso_type isn't set for a GSO SKB
[ Upstream commit 1d155dfdf50efc2b0793bce93c06d1a5b23d0877 ]
In bug report [0] a warning in r8169 driver was reported that was
caused by an invalid GSO SKB (gso_type was 0). See [1] for a discussion
about this issue. Still the origin of the invalid GSO SKB isn't clear.
It shouldn't be a network drivers task to check for invalid GSO SKB's.
Also, even if issue [0] can be fixed, we can't be sure that a
similar issue doesn't pop up again at another place.
Therefore let gso_features_check() check for such invalid GSO SKB's.
[0] https://bugzilla.kernel.org/show_bug.cgi?id=209423
[1] https://www.spinics.net/lists/netdev/msg690794.html
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://lore.kernel.org/r/97c78d21-7f0b-d843-df17-3589f224d2cf@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: 24ab059d2ebd ("net: check dev->gso_max_size in gso_features_check()")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/core/dev.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/net/core/dev.c b/net/core/dev.c
index a381e87fb380b..9845dcf0a3ded 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3140,6 +3140,11 @@ static netdev_features_t gso_features_check(const struct sk_buff *skb,
if (gso_segs > dev->gso_max_segs)
return features & ~NETIF_F_GSO_MASK;
+ if (!skb_shinfo(skb)->gso_type) {
+ skb_warn_bad_offload(skb);
+ return features & ~NETIF_F_GSO_MASK;
+ }
+
/* Support for GSO partial features requires software
* intervention before we can actually process the packets
* so we need to strip support for any partial features now
--
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