From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7CBF738BF8C for ; Mon, 9 Mar 2026 11:14:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773054879; cv=none; b=s93V+HLdwtK7GktYQGAHZbi6gf7QUYAT7bnEEPUYQUi/Dejy5vqZxPfL8hA6fcfciyFbjgrXsFq2opIvU5YwFsaTQ8+u1ky1WYV2ml5vWmziwOtQXkDuj6/QXiltI8eXNjArv3G2j2af1jDcOeaQnfrXltXI28nPAk4MX97lAbk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773054879; c=relaxed/simple; bh=2W3pFSG6qYVC8K/NGbx/WunuYTdw5B6tOMZknbcTE5E=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=iloUX6MfyrxuW4LXxaO7QZhNB+h6c0ZrlOVrq/hxb/z+7Q1DTm4CeM94tPdYj+vg2arFHLoDxFl/TkEPIus5JvBMatlTOd/l5Nr6E7/orewJKVW8acoL2X6haD2pQJ5DSz95wqBpx8HiR+WfyTTF6W87wXMchBYZHAmRiR4a7aM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=pyC5AkNT; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="pyC5AkNT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AC809C4CEF7; Mon, 9 Mar 2026 11:14:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773054879; bh=2W3pFSG6qYVC8K/NGbx/WunuYTdw5B6tOMZknbcTE5E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pyC5AkNTnnZRnwbvxu4+PYlMmsk1Hir3ykO/rI65HGNnDBb//hPx91gnfO0hD4S74 ZzMrbhcaCdWwaBaYuW38iCuSJHbvR+gjZvN9aGPCoyyAbgVkAimmKJUwBjZw1MXIY9 lIW/vhjugl6Cuv8Wo9oIE3Bl34xZ7QEnRKd2tmil5cqA/mctqw+y4k2tSs57q6DwXk TaRPkj5A4NA8durk9/mgb2SXCVW9Qo/Njdijqq2gxN/F9TTDGkGVxWWT7u7nmBIsi1 umg7NK2YlvntXzgb6hcvYHNHu1YChLGP0+2lzftN1uMYTC2dI7lQte4zIP0IrVoPHY uBFQgaDZApjOQ== From: Sasha Levin To: stable@vger.kernel.org Cc: Daniel Hodges , Johannes Berg , Sasha Levin Subject: [PATCH 6.1.y] wifi: libertas: fix use-after-free in lbs_free_adapter() Date: Mon, 9 Mar 2026 07:14:37 -0400 Message-ID: <20260309111437.811502-1-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <2026030917-carry-easily-7913@gregkh> References: <2026030917-carry-easily-7913@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Daniel Hodges [ Upstream commit 03cc8f90d0537fcd4985c3319b4fafbf2e3fb1f0 ] 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@vger.kernel.org Signed-off-by: Daniel Hodges Link: https://patch.msgid.link/20260206195356.15647-1-git@danielhodges.dev Signed-off-by: Johannes Berg [ del_timer() => timer_delete_sync() ] Signed-off-by: Sasha Levin --- 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 78e8b5aecec0e..91b9501c6d8cb 100644 --- a/drivers/net/wireless/marvell/libertas/main.c +++ b/drivers/net/wireless/marvell/libertas/main.c @@ -881,8 +881,8 @@ static void lbs_free_adapter(struct lbs_private *priv) { lbs_free_cmd_buffer(priv); kfifo_free(&priv->event_fifo); - del_timer(&priv->command_timer); - del_timer(&priv->tx_lockup_timer); + timer_delete_sync(&priv->command_timer); + timer_delete_sync(&priv->tx_lockup_timer); del_timer(&priv->auto_deepsleep_timer); } -- 2.51.0