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 87D0044AB91; Tue, 21 Jul 2026 21:44:08 +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=1784670249; cv=none; b=ui4kEkj9QYEoMat4necqRX+/OCbW1AppTCrjpe2zOf69RDLNhVcam/WKRvqSkeukS5msjQDvV09vdhsZvfdjAWRl0APOVxz4Zm93NIdpi+Ily/QNaknxqnv8klvTTU0knHp8RxLVfeuS5nKQ7eACxSEVvjax3pgQRO4qFtyQtbQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784670249; c=relaxed/simple; bh=p3l7FJA7raJkfNgmfJ2wNYOgZaisoksBAO10ViZm1iE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=HZ5pz9sBE/610It+MfirtfWDdAhHYylwEwyi3KuQMNvWc8CtafhDxpw0xutqRI1y4r89LTz00oF2u0Bb2xmewNaiPnfeo4B8ASIFqSBur93cJOE5TbiB5BSHNWW8O+giNHNjqA09Q2ZoKf7YeCuHMFJ/E6cBSBMk3pAlEq3PE5M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=AhGc601X; 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="AhGc601X" Received: by smtp.kernel.org (Postfix) with ESMTPSA id ED2451F00A3A; Tue, 21 Jul 2026 21:44:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784670248; bh=5DC/NQ3jJHJjuBa444REY8SpDhmjkgpoFKiOWd8gCJ8=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=AhGc601XpaOAngdSQdRxqVTS5pYc5opF4OwZ9lCweolhG1ggIjji/M3nWpv4gifSh C7RJ66iwFULZyZLV3v/JKFvq3CLa/l4UqqaOO7Od6JG29aetsj6HX+Szxp5sIsdev9 egvLcUFSXsL8NoXtkdBORgob5CPmjJ2Kq/b0iFKM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Sashiko bot , Dmitry Torokhov Subject: [PATCH 6.1 0861/1067] Input: ims-pcu - fix use-after-free and double-free in disconnect Date: Tue, 21 Jul 2026 17:24:22 +0200 Message-ID: <20260721152443.803124440@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152424.521567757@linuxfoundation.org> References: <20260721152424.521567757@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 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Dmitry Torokhov commit 462a999917755a3bf77448dfd64307963cf0a9f0 upstream. ims_pcu_disconnect() only intended to perform cleanup when the primary (control) interface is unbound. However, it currently relies on the interface class to distinguish between control and data interfaces. A malicious device could present a data interface with the same class as the control interface, leading to premature cleanup and potential use-after-free or double-free. Switch to verifying that the interface being disconnected is indeed the control interface. Fixes: 628329d52474 ("Input: add IMS Passenger Control Unit driver") Cc: stable@vger.kernel.org Reported-by: Sashiko bot Assisted-by: Gemini:gemini-3.1-pro Signed-off-by: Dmitry Torokhov Signed-off-by: Greg Kroah-Hartman --- drivers/input/misc/ims-pcu.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/drivers/input/misc/ims-pcu.c +++ b/drivers/input/misc/ims-pcu.c @@ -2065,7 +2065,6 @@ err_free_mem: static void ims_pcu_disconnect(struct usb_interface *intf) { struct ims_pcu *pcu = usb_get_intfdata(intf); - struct usb_host_interface *alt = intf->cur_altsetting; usb_set_intfdata(intf, NULL); @@ -2073,7 +2072,7 @@ static void ims_pcu_disconnect(struct us * See if we are dealing with control or data interface. The cleanup * happens when we unbind primary (control) interface. */ - if (alt->desc.bInterfaceClass != USB_CLASS_COMM) + if (intf != pcu->ctrl_intf) return; sysfs_remove_group(&intf->dev.kobj, &ims_pcu_attr_group);