netdev - [PATCH] nfc: hci: shdlc: Stop timers and work before freeing context

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Message-ID: <20260203113158.2008723-1-Victoria.Votokina@kaspersky.com>
Date: Tue, 3 Feb 2026 14:31:57 +0300
From: Votokina Victoria <Victoria.Votokina@...persky.com>
To: "David S . Miller" <davem@...emloft.net>
CC: Votokina Victoria <Victoria.Votokina@...persky.com>, Eric Dumazet
	<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, Simon Horman <horms@...nel.org>, Thomas Gleixner
	<tglx@...nel.org>, Ingo Molnar <mingo@...nel.org>, Eric Lapuyade
	<eric.lapuyade@...ux.intel.com>, Samuel Ortiz <sameo@...ux.intel.com>,
	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<lvc-project@...uxtesting.org>
Subject: [PATCH] nfc: hci: shdlc: Stop timers and work before freeing context

llc_shdlc_deinit() purges SHDLC skb queues and frees the llc_shdlc
structure while its timers and state machine work may still be active.

Timer callbacks can schedule sm_work, and sm_work accesses SHDLC state
and the skb queues. If teardown happens in parallel with a queued/running
work item, it can lead to UAF and other shutdown races.

Stop all SHDLC timers and cancel sm_work synchronously before purging the
queues and freeing the context.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 4a61cd6687fc ("NFC: Add an shdlc llc module to llc core")
Signed-off-by: Votokina Victoria <Victoria.Votokina@...persky.com>
---
 net/nfc/hci/llc_shdlc.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/net/nfc/hci/llc_shdlc.c b/net/nfc/hci/llc_shdlc.c
index 4fc37894860c..08c8aa1530d8 100644
--- a/net/nfc/hci/llc_shdlc.c
+++ b/net/nfc/hci/llc_shdlc.c
@@ -762,6 +762,14 @@ static void llc_shdlc_deinit(struct nfc_llc *llc)
 {
 	struct llc_shdlc *shdlc = nfc_llc_get_data(llc);
 
+	timer_shutdown_sync(&shdlc->connect_timer);
+	timer_shutdown_sync(&shdlc->t1_timer);
+	timer_shutdown_sync(&shdlc->t2_timer);
+	shdlc->t1_active = false;
+	shdlc->t2_active = false;
+
+	cancel_work_sync(&shdlc->sm_work);
+
 	skb_queue_purge(&shdlc->rcv_q);
 	skb_queue_purge(&shdlc->send_q);
 	skb_queue_purge(&shdlc->ack_pending_q);
-- 
2.43.0