From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3A786C49361 for ; Tue, 8 Jun 2021 18:48:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 22BEE61463 for ; Tue, 8 Jun 2021 18:48:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236229AbhFHSuI (ORCPT ); Tue, 8 Jun 2021 14:50:08 -0400 Received: from mail.kernel.org ([198.145.29.99]:44348 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235829AbhFHSpM (ORCPT ); Tue, 8 Jun 2021 14:45:12 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 18AA9613EF; Tue, 8 Jun 2021 18:36:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1623177418; bh=slXEvorXgnkERiCypSz2a2OJZYDxd1ky0BIT90n/41U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ruyni5EGDZmIyB/2YAB5YaGuKbfL5T4B+iZNHtJ6S7OMSEGomAAC/Gm+FYpxwYxLz SPxuCE8kIVQsX+4p9EjrdGt5pBlLG9zWLjGaBeo5qy6nLxO2ubu57g5du5F5eFLeBs p2+zY9NTQ/JeuvlH2sQMk7SomUzvPRRcVno0bSwk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+ee6f6e2e68886ca256a8@syzkaller.appspotmail.com, Claudio Mettler , Marek Wyborski , Sean OBrien , Johan Hovold , Jiri Kosina Subject: [PATCH 5.4 45/78] HID: magicmouse: fix NULL-deref on disconnect Date: Tue, 8 Jun 2021 20:27:14 +0200 Message-Id: <20210608175936.788029092@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210608175935.254388043@linuxfoundation.org> References: <20210608175935.254388043@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Johan Hovold commit 4b4f6cecca446abcb686c6e6c451d4f1ec1a7497 upstream. Commit 9d7b18668956 ("HID: magicmouse: add support for Apple Magic Trackpad 2") added a sanity check for an Apple trackpad but returned success instead of -ENODEV when the check failed. This means that the remove callback will dereference the never-initialised driver data pointer when the driver is later unbound (e.g. on USB disconnect). Reported-by: syzbot+ee6f6e2e68886ca256a8@syzkaller.appspotmail.com Fixes: 9d7b18668956 ("HID: magicmouse: add support for Apple Magic Trackpad 2") Cc: stable@vger.kernel.org # 4.20 Cc: Claudio Mettler Cc: Marek Wyborski Cc: Sean O'Brien Signed-off-by: Johan Hovold Signed-off-by: Jiri Kosina Signed-off-by: Greg Kroah-Hartman --- drivers/hid/hid-magicmouse.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/hid/hid-magicmouse.c +++ b/drivers/hid/hid-magicmouse.c @@ -597,7 +597,7 @@ static int magicmouse_probe(struct hid_d if (id->vendor == USB_VENDOR_ID_APPLE && id->product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2 && hdev->type != HID_TYPE_USBMOUSE) - return 0; + return -ENODEV; msc = devm_kzalloc(&hdev->dev, sizeof(*msc), GFP_KERNEL); if (msc == NULL) {