[PATCH net v1] llc: fix SAP refcount leak when creating incoming sockets

[Xuanqiang Luo]

From: Xuanqiang Luo <luoxuanqiang@xxxxxxxxxx>

llc_sap_add_socket() takes a SAP reference for each socket added to a SAP,
and llc_sap_remove_socket() releases it. llc_create_incoming_sock() takes
an additional SAP reference after adding the child socket.

This extra reference was balanced by an explicit llc_sap_put() in
llc_ui_release() until commit 3100aa9d74db ("llc: fix SAP reference
counting w.r.t. socket handling") removed that put. The corresponding hold
in the accept path was left behind.

When such a child socket is removed, only the reference taken by
llc_sap_add_socket() is released. The extra reference keeps the SAP alive
after its last socket is removed. Remove the obsolete hold.

Fixes: 3100aa9d74db ("llc: fix SAP reference counting w.r.t. socket handling")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Xuanqiang Luo <luoxuanqiang@xxxxxxxxxx>
---
 net/llc/llc_conn.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/net/llc/llc_conn.c b/net/llc/llc_conn.c
index e8f427375c68..260460d50f54 100644
--- a/net/llc/llc_conn.c
+++ b/net/llc/llc_conn.c
@@ -767,7 +767,6 @@ static struct sock *llc_create_incoming_sock(struct sock *sk,
 	newllc->dev = dev;
 	dev_hold(dev);
 	llc_sap_add_socket(llc->sap, newsk);
-	llc_sap_hold(llc->sap);
 out:
 	return newsk;
 }
-- 
2.51.0