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

From: Greg Kroah-Hartman
Date: Tue Jun 08 2021 - 14:55:57 EST


From: Alexander Aring <aahringo@xxxxxxxxxx>

[ 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@xxxxxxxxx>
Signed-off-by: Alexander Aring <aahringo@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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