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From: Paolo Abeni <pabeni@redhat.com>
To: netdev@vger.kernel.org
Cc: "David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Mat Martineau <mathew.j.martineau@linux.intel.com>
Subject: [PATCH net-next] net: fix GRO skb truesize update
Date: Wed,  4 Aug 2021 21:07:00 +0200	[thread overview]
Message-ID: <9134e63fd0d42787e4fbd4bd890d330d6fda9f81.1628097645.git.pabeni@redhat.com> (raw)

commit 5e10da5385d2 ("skbuff: allow 'slow_gro' for skb carring sock
reference") introduces a serious regression at the GRO layer setting
the wrong truesize for stolen-head skbs.

Restore the correct truesize: SKB_DATA_ALIGN(...) instead of
SKB_TRUESIZE(...)

Reported-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Fixes: 5e10da5385d2 ("skbuff: allow 'slow_gro' for skb carring sock reference")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---
 net/core/skbuff.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 97ed77a86bb0..02a603556408 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -4375,7 +4375,7 @@ int skb_gro_receive(struct sk_buff *p, struct sk_buff *skb)
 		memcpy(frag + 1, skbinfo->frags, sizeof(*frag) * skbinfo->nr_frags);
 		/* We dont need to clear skbinfo->nr_frags here */
 
-		new_truesize = SKB_TRUESIZE(sizeof(struct sk_buff));
+		new_truesize = SKB_DATA_ALIGN(sizeof(struct sk_buff));
 		delta_truesize = skb->truesize - new_truesize;
 		skb->truesize = new_truesize;
 		NAPI_GRO_CB(skb)->free = NAPI_GRO_FREE_STOLEN_HEAD;
-- 
2.26.3


             reply	other threads:[~2021-08-04 19:07 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-04 19:07 Paolo Abeni [this message]
2021-08-04 19:29 ` Mat Martineau
2021-08-05 10:40 ` patchwork-bot+netdevbpf

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