linux-kernel - [PATCH AUTOSEL 4.19 459/671] net/tls: fix socket wmem accounting on fallback with netem

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Date:   Thu, 16 Jan 2020 12:01:37 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Dirk van der Merwe <dirk.vandermerwe@...ronome.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 459/671] net/tls: fix socket wmem accounting on fallback with netem

From: Jakub Kicinski <jakub.kicinski@...ronome.com>

[ Upstream commit 5c4b4608fe100838c62591877101128467e56c00 ]

netem runs skb_orphan_partial() which "disconnects" the skb
from normal TCP write memory accounting.  We should not adjust
sk->sk_wmem_alloc on the fallback path for such skbs.

Fixes: e8f69799810c ("net/tls: Add generic NIC offload infrastructure")
Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
Reviewed-by: Dirk van der Merwe <dirk.vandermerwe@...ronome.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/tls/tls_device_fallback.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/tls/tls_device_fallback.c b/net/tls/tls_device_fallback.c
index 426dd97725e4..6cf832891b53 100644
--- a/net/tls/tls_device_fallback.c
+++ b/net/tls/tls_device_fallback.c
@@ -208,6 +208,10 @@ static void complete_skb(struct sk_buff *nskb, struct sk_buff *skb, int headln)
 
 	update_chksum(nskb, headln);
 
+	/* sock_efree means skb must gone through skb_orphan_partial() */
+	if (nskb->destructor == sock_efree)
+		return;
+
 	delta = nskb->truesize - skb->truesize;
 	if (likely(delta < 0))
 		WARN_ON_ONCE(refcount_sub_and_test(-delta, &sk->sk_wmem_alloc));
-- 
2.20.1