linux-kernel - [PATCH 5.4 109/158] bpf, sockmap: Use truesize with sk_rmem

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Date:   Mon, 23 Nov 2020 13:22:17 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Daniel Borkman <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        Jakub Sitnicki <jakub@...udflare.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 109/158] bpf, sockmap: Use truesize with sk_rmem_schedule()

From: John Fastabend <john.fastabend@...il.com>

[ Upstream commit 70796fb751f1d34cc650e640572a174faf009cd4 ]

We use skb->size with sk_rmem_scheduled() which is not correct. Instead
use truesize to align with socket and tcp stack usage of sk_rmem_schedule.

Suggested-by: Daniel Borkman <daniel@...earbox.net>
Signed-off-by: John Fastabend <john.fastabend@...il.com>
Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
Reviewed-by: Jakub Sitnicki <jakub@...udflare.com>
Link: https://lore.kernel.org/bpf/160556570616.73229.17003722112077507863.stgit@john-XPS-13-9370
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/core/skmsg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/skmsg.c b/net/core/skmsg.c
index 4fad59ee3df0b..ddb1b7d94c998 100644
--- a/net/core/skmsg.c
+++ b/net/core/skmsg.c
@@ -411,7 +411,7 @@ static int sk_psock_skb_ingress(struct sk_psock *psock, struct sk_buff *skb)
 	msg = kzalloc(sizeof(*msg), __GFP_NOWARN | GFP_ATOMIC);
 	if (unlikely(!msg))
 		return -EAGAIN;
-	if (!sk_rmem_schedule(sk, skb, skb->len)) {
+	if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
 		kfree(msg);
 		return -EAGAIN;
 	}
-- 
2.27.0