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llc: fix SAP refcount leak when creating incoming sockets

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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 3100aa9d74 ("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: 3100aa9d74 ("llc: fix SAP reference counting w.r.t. socket handling")
Cc: stable@vger.kernel.org
Signed-off-by: Xuanqiang Luo <luoxuanqiang@kylinos.cn>
Link: https://patch.msgid.link/20260712130343.518797-1-xuanqiang.luo@linux.dev
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Xuanqiang Luo 2026-07-12 21:03:43 +08:00 committed by Paolo Abeni
parent 04aeddf2da
commit 2c72eb6286
1 changed files with 0 additions and 1 deletions
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1
net/llc/llc_conn.c
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@ -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;
}