[PATCH 5.15 213/843] afs: Fix netns teardown to cancel the preallocation charger

[Greg Kroah-Hartman]

5.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Howells <dhowells at redhat.com>

commit 47694fbc9d24ab6bf210f91e8efe06a10a478064 upstream.

Fix the teardown of an afs network namespace to make sure it cancels the
work item that keeps the preallocated rxrpc call/conn/peer queue charged
before incoming calls are disabled (i.e. listen 0).

Also, if net->live is false because the afs netns is being deleted, make
afs_charge_preallocation() skip charging and make afs_rx_new_call() avoid
requeuing the charger.

(This was found by AI review).

Fixes: 00e907127e6f ("rxrpc: Preallocate peers, conns and calls for incoming service requests")
Reported-by: Simon Horman <horms at kernel.org>
Signed-off-by: David Howells <dhowells at redhat.com>
cc: Li Daming <d4n.for.sec at gmail.com>
cc: Ren Wei <n05ec at lzu.edu.cn>
cc: Marc Dionne <marc.dionne at auristor.com>
cc: Jeffrey Altman <jaltman at auristor.com>
cc: linux-afs at lists.infradead.org
cc: stable at kernel.org
Link: https://patch.msgid.link/20260609140911.838677-5-dhowells@redhat.com
Signed-off-by: Jakub Kicinski <kuba at kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 fs/afs/rxrpc.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/fs/afs/rxrpc.c
+++ b/fs/afs/rxrpc.c
@@ -107,6 +107,7 @@ void afs_close_socket(struct afs_net *ne
 {
 	_enter("");
 
+	cancel_work_sync(&net->charge_preallocation_work);
 	kernel_listen(net->socket, 0);
 	flush_workqueue(afs_async_calls);
 
@@ -716,7 +717,7 @@ void afs_charge_preallocation(struct wor
 		container_of(work, struct afs_net, charge_preallocation_work);
 	struct afs_call *call = net->spare_incoming_call;
 
-	for (;;) {
+	while (READ_ONCE(net->live)) {
 		if (!call) {
 			call = afs_alloc_call(net, &afs_RXCMxxxx, GFP_KERNEL);
 			if (!call)
@@ -761,7 +762,8 @@ static void afs_rx_new_call(struct sock
 {
 	struct afs_net *net = afs_sock2net(sk);
 
-	queue_work(afs_wq, &net->charge_preallocation_work);
+	if (net->live)
+		queue_work(afs_wq, &net->charge_preallocation_work);
 }
 
 /*