linux-kernel - [PATCH 5.10 026/137] net: sock: fix in-kernel mark setting

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Date:   Tue,  8 Jun 2021 20:26:06 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Alexander Aring <aahringo@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 026/137] net: sock: fix in-kernel mark setting

From: Alexander Aring <aahringo@...hat.com>

[ Upstream commit dd9082f4a9f94280fbbece641bf8fc0a25f71f7a ]

This patch fixes the in-kernel mark setting by doing an additional
sk_dst_reset() which was introduced by commit 50254256f382 ("sock: Reset
dst when changing sk_mark via setsockopt"). The code is now shared to
avoid any further suprises when changing the socket mark value.

Fixes: 84d1c617402e ("net: sock: add sock_set_mark")
Reported-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Signed-off-by: Alexander Aring <aahringo@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/core/sock.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/net/core/sock.c b/net/core/sock.c
index dee29f41beaf..7de51ea15cdf 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -807,10 +807,18 @@ void sock_set_rcvbuf(struct sock *sk, int val)
 }
 EXPORT_SYMBOL(sock_set_rcvbuf);
 
+static void __sock_set_mark(struct sock *sk, u32 val)
+{
+	if (val != sk->sk_mark) {
+		sk->sk_mark = val;
+		sk_dst_reset(sk);
+	}
+}
+
 void sock_set_mark(struct sock *sk, u32 val)
 {
 	lock_sock(sk);
-	sk->sk_mark = val;
+	__sock_set_mark(sk, val);
 	release_sock(sk);
 }
 EXPORT_SYMBOL(sock_set_mark);
@@ -1118,10 +1126,10 @@ set_sndbuf:
 	case SO_MARK:
 		if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
 			ret = -EPERM;
-		} else if (val != sk->sk_mark) {
-			sk->sk_mark = val;
-			sk_dst_reset(sk);
+			break;
 		}
+
+		__sock_set_mark(sk, val);
 		break;
 
 	case SO_RXQ_OVFL:
-- 
2.30.2