From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 B90FB3264C2; Wed, 30 Sep 2026 17:50:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790790615; cv=none; b=q5Oszm47PhTeDTJr7i4CEgL1EfSdr9cx3koq+SDrDTZ9ipdwzk2yKUAyQTSVUJCgoPHP27aAupaHzsQIrPg/0ZFe8aacyjaLEautVRvl2zZRTcBpuk5/ogCPpKCTOuuSpIjb4M3PogkbZMg7z0YtZM9DvUfzfVK2NDKEwX2mJmo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790790615; c=relaxed/simple; bh=EDdIM6Itr/TJbxqBKYrFno96C1iMIAv6x0IRJEcDQYQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Wfa99pKta5vZ9Wga/BLxVzSEpygan12pbchHvZ7NCF0BuOM4Vw8kDpu17k4IjHGmbr5OFrrq2SA2VKHFlRbv5LCE8ZpFu6lv6DO3ZvNULWwbGuEhljHV42utRd9SGUxuhTHk6lAD9hi4NWi3umdCZh7wkb+sfx+jovVf+P+zZc4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=rFJCeUYm; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="rFJCeUYm" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 21DB21F000FF; Wed, 30 Sep 2026 17:50:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790790613; bh=w/xlqYoivuEdSyMKP/JkhzvRV1gQ7qaoUF3dgnYw29M=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=rFJCeUYmv83joO76wKESCVgLVR9z2vcErdPoQAEW/Cu4H1uNHcEG+nVOyv47J0nHS yRrqav5JKR5EAEbtN3flL0552HhtXIiXJp6GF58JC1TyIc8BARRiJj9sbX/ZsODNye fkphT7reHrDdt3y9JrNebLYx01sY3jQ/kPxOWeRk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Mika Westerberg , Sasha Levin Subject: [PATCH 5.15 014/752] thunderbolt: Keep the domain reference while processing hotplug Date: Wed, 30 Sep 2026 17:18:04 +0200 Message-ID: <20260930152358.455729743@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260930152358.131179731@linuxfoundation.org> References: <20260930152358.131179731@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mika Westerberg [ Upstream commit 138ec65b2c761f065b19d115aed2b8246fc272f5 ] We process hotplug events in a workqueue that may run after the domain has been removed by tb_domain_remove(). For example if user unloads the driver while at the same time plugging a device router we may have scheduled tb_handle_hotplug() to run. Avoid possible UAF in this case by taking the domain reference before scheduling the hotplug handler in tb_queue_hotplug(). Signed-off-by: Mika Westerberg Signed-off-by: Sasha Levin --- drivers/thunderbolt/tb.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c index 5b2a74a1bec36..ed001dfd2cb4e 100644 --- a/drivers/thunderbolt/tb.c +++ b/drivers/thunderbolt/tb.c @@ -59,7 +59,7 @@ static void tb_queue_hotplug(struct tb *tb, u64 route, u8 port, bool unplug) if (!ev) return; - ev->tb = tb; + ev->tb = tb_domain_get(tb); ev->route = route; ev->port = port; ev->unplug = unplug; @@ -1315,6 +1315,9 @@ static void tb_handle_hotplug(struct work_struct *work) pm_runtime_mark_last_busy(&tb->dev); pm_runtime_put_autosuspend(&tb->dev); + /* Undo the refcount increased in tb_queue_hotplug() */ + tb_domain_put(tb); + kfree(ev); } -- 2.53.0