linux-kernel - [PATCH] netlink: Unset cb_running when terminating dump on release

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Message-ID: <aff028e3eb2b768b9895fa6349fa1981ae22f098.camel@oracle.com>
Date: Sat, 15 Feb 2025 09:40:51 +0000
From: Siddh Raman Pant <siddh.raman.pant@...cle.com>
To: "kuba@...nel.org" <kuba@...nel.org>
CC: "edumazet@...gle.com" <edumazet@...gle.com>,
        "davem@...emloft.net"
	<davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: [PATCH] netlink: Unset cb_running when terminating dump on release

When we terminated the dump, the callback isn't running, so cb_running
should be set to false to be logically consistent.

cb_running signifies whether a dump is ongoing. It is set to true in
cb->start(), and is checked in netlink_dump() to be true initially.
After the dump, it is set to false in the same function.

When we terminate a dump before it ends (see 1904fb9ebf91 ("netlink:
terminate outstanding dump on socket close")), we do not unset the
boolean flag cb_running. This is wrong - since the dump is no longer
running (we terminated it), it must be set to false to convey the
correct state.

Signed-off-by: Siddh Raman Pant <siddh.raman.pant@...cle.com>
---
 net/netlink/af_netlink.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 85311226183a..f8f13058a46e 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -771,6 +771,7 @@ static int netlink_release(struct socket *sock)
 			nlk->cb.done(&nlk->cb);
 		module_put(nlk->cb.module);
 		kfree_skb(nlk->cb.skb);
+		WRITE_ONCE(nlk->cb_running, false);
 	}

 	module_put(nlk->module);
-- 
2.45.2

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