linux-kernel - [PATCH] wifi: libertas: fix use-after-free in lbs_free

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Message-ID: <20260206195356.15647-1-git@danielhodges.dev>
Date: Fri,  6 Feb 2026 14:53:56 -0500
From: Daniel Hodges <git@...ielhodges.dev>
To: linux-wireless@...r.kernel.org
Cc: libertas-dev@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	stable@...r.kernel.org,
	Daniel Drake <dsd@...top.org>,
	Dan Williams <dcbw@...hat.com>,
	Daniel Hodges <git@...ielhodges.dev>
Subject: [PATCH] wifi: libertas: fix use-after-free in lbs_free_adapter()

The lbs_free_adapter() function uses timer_delete() (non-synchronous)
for both command_timer and tx_lockup_timer before the structure is
freed. This is incorrect because timer_delete() does not wait for
any running timer callback to complete.

If a timer callback is executing when lbs_free_adapter() is called,
the callback will access freed memory since lbs_cfg_free() frees the
containing structure immediately after lbs_free_adapter() returns.

Both timer callbacks (lbs_cmd_timeout_handler and lbs_tx_lockup_handler)
access priv->driver_lock, priv->cur_cmd, priv->dev, and other fields,
which would all be use-after-free violations.

Use timer_delete_sync() instead to ensure any running timer callback
has completed before returning.

This bug was introduced in commit 8f641d93c38a ("libertas: detect TX
lockups and reset hardware") where del_timer() was used instead of
del_timer_sync() in the cleanup path. The command_timer has had the
same issue since the driver was first written.

Fixes: 8f641d93c38a ("libertas: detect TX lockups and reset hardware")
Fixes: 954ee164f4f4 ("[PATCH] libertas: reorganize and simplify init sequence")
Cc: stable@...r.kernel.org
Signed-off-by: Daniel Hodges <git@...ielhodges.dev>
---
 drivers/net/wireless/marvell/libertas/main.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/marvell/libertas/main.c b/drivers/net/wireless/marvell/libertas/main.c
index d44e02c6fe38..dd97f1b61f4d 100644
--- a/drivers/net/wireless/marvell/libertas/main.c
+++ b/drivers/net/wireless/marvell/libertas/main.c
@@ -799,8 +799,8 @@ static void lbs_free_adapter(struct lbs_private *priv)
 {
 	lbs_free_cmd_buffer(priv);
 	kfifo_free(&priv->event_fifo);
-	timer_delete(&priv->command_timer);
-	timer_delete(&priv->tx_lockup_timer);
+	timer_delete_sync(&priv->command_timer);
+	timer_delete_sync(&priv->tx_lockup_timer);
 }

 static const struct net_device_ops lbs_netdev_ops = {
-- 
2.52.0