linux-kernel - [PATCH] net/ipv4/tcp_bpf: Delete an unnecessary check before the function call “consume

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Date:   Thu, 22 Aug 2019 18:32:14 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Hideaki Yoshifuji <yoshfuji@...ux-ipv6.org>,
        John Fastabend <john.fastabend@...il.com>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] net/ipv4/tcp_bpf: Delete an unnecessary check before the function call “consume_skb”

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Thu, 22 Aug 2019 18:20:42 +0200

The consume_skb() function performs also input parameter validation.
Thus the test around the call is not needed.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 net/ipv4/tcp_bpf.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/net/ipv4/tcp_bpf.c b/net/ipv4/tcp_bpf.c
index 8a56e09cfb0e..4ae18bd431a0 100644
--- a/net/ipv4/tcp_bpf.c
+++ b/net/ipv4/tcp_bpf.c
@@ -103,8 +103,7 @@ int __tcp_bpf_recvmsg(struct sock *sk, struct sk_psock *psock,
 		msg_rx->sg.start = i;
 		if (!sge->length && msg_rx->sg.start == msg_rx->sg.end) {
 			list_del(&msg_rx->list);
-			if (msg_rx->skb)
-				consume_skb(msg_rx->skb);
+			consume_skb(msg_rx->skb);
 			kfree(msg_rx);
 		}
 		msg_rx = list_first_entry_or_null(&psock->ingress_msg,
--
2.23.0