path: root/net/rxrpc/conn_event.c
diff options
authorDavid Howells <dhowells@redhat.com>2020-01-30 21:50:36 +0000
committerDavid Howells <dhowells@redhat.com>2020-01-30 21:50:41 +0000
commit04d36d748fac349b068ef621611f454010054c58 (patch)
tree77b18f2ab733cda5c199ea289d3008df7726fa46 /net/rxrpc/conn_event.c
parentrxrpc: Fix insufficient receive notification generation (diff)
rxrpc: Fix missing active use pinning of rxrpc_local object
The introduction of a split between the reference count on rxrpc_local objects and the usage count didn't quite go far enough. A number of kernel work items need to make use of the socket to perform transmission. These also need to get an active count on the local object to prevent the socket from being closed. Fix this by getting the active count in those places. Also split out the raw active count get/put functions as these places tend to hold refs on the rxrpc_local object already, so getting and putting an extra object ref is just a waste of time. The problem can lead to symptoms like: BUG: kernel NULL pointer dereference, address: 0000000000000018 .. CPU: 2 PID: 818 Comm: kworker/u9:0 Not tainted 5.5.0-fscache+ #51 ... RIP: 0010:selinux_socket_sendmsg+0x5/0x13 ... Call Trace: security_socket_sendmsg+0x2c/0x3e sock_sendmsg+0x1a/0x46 rxrpc_send_keepalive+0x131/0x1ae rxrpc_peer_keepalive_worker+0x219/0x34b process_one_work+0x18e/0x271 worker_thread+0x1a3/0x247 kthread+0xe6/0xeb ret_from_fork+0x1f/0x30 Fixes: 730c5fd42c1e ("rxrpc: Fix local endpoint refcounting") Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to '')
1 files changed, 20 insertions, 10 deletions
diff --git a/net/rxrpc/conn_event.c b/net/rxrpc/conn_event.c
index 808a4723f868..06fcff2ebbba 100644
--- a/net/rxrpc/conn_event.c
+++ b/net/rxrpc/conn_event.c
@@ -438,16 +438,12 @@ again:
* connection-level event processor
-void rxrpc_process_connection(struct work_struct *work)
+static void rxrpc_do_process_connection(struct rxrpc_connection *conn)
- struct rxrpc_connection *conn =
- container_of(work, struct rxrpc_connection, processor);
struct sk_buff *skb;
u32 abort_code = RX_PROTOCOL_ERROR;
int ret;
- rxrpc_see_connection(conn);
if (test_and_clear_bit(RXRPC_CONN_EV_CHALLENGE, &conn->events))
@@ -475,18 +471,32 @@ void rxrpc_process_connection(struct work_struct *work)
- rxrpc_put_connection(conn);
- _leave("");
skb_queue_head(&conn->rx_queue, skb);
- goto out;
+ return;
if (rxrpc_abort_connection(conn, ret, abort_code) < 0)
goto requeue_and_leave;
rxrpc_free_skb(skb, rxrpc_skb_freed);
- goto out;
+ return;
+void rxrpc_process_connection(struct work_struct *work)
+ struct rxrpc_connection *conn =
+ container_of(work, struct rxrpc_connection, processor);
+ rxrpc_see_connection(conn);
+ if (__rxrpc_use_local(conn->params.local)) {
+ rxrpc_do_process_connection(conn);
+ rxrpc_unuse_local(conn->params.local);
+ }
+ rxrpc_put_connection(conn);
+ _leave("");
+ return;