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Message-ID: <20231008052101.144422-3-akihiko.odaki@daynix.com>
Date: Sun, 8 Oct 2023 14:20:46 +0900
From: Akihiko Odaki <akihiko.odaki@...nix.com>
To:
Cc: Willem de Bruijn <willemdebruijn.kernel@...il.com>,
Jason Wang <jasowang@...hat.com>,
"Michael S. Tsirkin" <mst@...hat.com>,
Xuan Zhuo Shuah Khan <"xuanzhuo@...ux.alibaba.comshuah"@kernel.org>,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
linux-kselftest@...r.kernel.org, bpf@...r.kernel.org,
davem@...emloft.net, kuba@...nel.org, ast@...nel.org,
daniel@...earbox.net, andrii@...nel.org, kafai@...com,
songliubraving@...com, yhs@...com, john.fastabend@...il.com,
kpsingh@...nel.org, rdunlap@...radead.org, willemb@...gle.com,
gustavoars@...nel.org, herbert@...dor.apana.org.au,
steffen.klassert@...unet.com, nogikh@...gle.com, pablo@...filter.org,
decui@...rosoft.com, cai@....pw, jakub@...udflare.com,
elver@...gle.com, pabeni@...hat.com,
Yuri Benditovich <yuri.benditovich@...nix.com>,
Akihiko Odaki <akihiko.odaki@...nix.com>
Subject: [RFC PATCH 2/7] net/core: Ensure qdisc_skb_cb will not be overwritten
Later qdisc_skb_cb will be used to deliver virtio-net hash information
for tun.
Signed-off-by: Akihiko Odaki <akihiko.odaki@...nix.com>
---
net/core/dev.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/net/core/dev.c b/net/core/dev.c
index 85df22f05c38..305fb465cc1e 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3622,6 +3622,7 @@ static struct sk_buff *validate_xmit_skb(struct sk_buff *skb, struct net_device
if (netif_needs_gso(skb, features)) {
struct sk_buff *segs;
+ BUILD_BUG_ON(sizeof(struct qdisc_skb_cb) > SKB_GSO_CB_OFFSET);
segs = skb_gso_segment(skb, features);
if (IS_ERR(segs)) {
goto out_kfree_skb;
--
2.42.0
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