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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8FE88C433F5 for ; Mon, 20 Dec 2021 14:37:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233965AbhLTOhY (ORCPT ); Mon, 20 Dec 2021 09:37:24 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59358 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233961AbhLTOhH (ORCPT ); Mon, 20 Dec 2021 09:37:07 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9783CC06175B; Mon, 20 Dec 2021 06:37:07 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 58658B80EE4; Mon, 20 Dec 2021 14:37:06 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8D670C36AE7; Mon, 20 Dec 2021 14:37:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1640011025; bh=SI0+HK4ruuDe7k2ecKTb663fseSRDlsvJTY43eeUJCQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=P6hI0GcALChH1JRCIZz5P0J/Op01lEpO29V4UKsGTNsyjS1bPOSj1IVI0kf9QuZL6 23kbKjgFFS7Ss2XPuvWrf9kaL8w2oZVw0owDTyYfhhaWIG8bHnD/A/ZCt1Zua1D23z 0PIjOly+WavsmcdOcPHU+czSklZdTzhzWYsQdR2E= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+f9f76f4a0766420b4a02@syzkaller.appspotmail.com, Tadeusz Struk , Krzysztof Kozlowski , Jakub Kicinski Subject: [PATCH 4.9 01/31] nfc: fix segfault in nfc_genl_dump_devices_done Date: Mon, 20 Dec 2021 15:34:01 +0100 Message-Id: <20211220143020.031915064@linuxfoundation.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20211220143019.974513085@linuxfoundation.org> References: <20211220143019.974513085@linuxfoundation.org> User-Agent: quilt/0.66 X-stable: review X-Patchwork-Hint: ignore 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: Tadeusz Struk commit fd79a0cbf0b2e34bcc45b13acf962e2032a82203 upstream. When kmalloc in nfc_genl_dump_devices() fails then nfc_genl_dump_devices_done() segfaults as below KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 0 PID: 25 Comm: kworker/0:1 Not tainted 5.16.0-rc4-01180-g2a987e65025e-dirty #5 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-6.fc35 04/01/2014 Workqueue: events netlink_sock_destruct_work RIP: 0010:klist_iter_exit+0x26/0x80 Call Trace: class_dev_iter_exit+0x15/0x20 nfc_genl_dump_devices_done+0x3b/0x50 genl_lock_done+0x84/0xd0 netlink_sock_destruct+0x8f/0x270 __sk_destruct+0x64/0x3b0 sk_destruct+0xa8/0xd0 __sk_free+0x2e8/0x3d0 sk_free+0x51/0x90 netlink_sock_destruct_work+0x1c/0x20 process_one_work+0x411/0x710 worker_thread+0x6fd/0xa80 Link: https://syzkaller.appspot.com/bug?id=fc0fa5a53db9edd261d56e74325419faf18bd0df Reported-by: syzbot+f9f76f4a0766420b4a02@syzkaller.appspotmail.com Signed-off-by: Tadeusz Struk Reviewed-by: Krzysztof Kozlowski Link: https://lore.kernel.org/r/20211208182742.340542-1-tadeusz.struk@linaro.org Signed-off-by: Jakub Kicinski Signed-off-by: Greg Kroah-Hartman --- net/nfc/netlink.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/net/nfc/netlink.c +++ b/net/nfc/netlink.c @@ -669,8 +669,10 @@ static int nfc_genl_dump_devices_done(st { struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0]; - nfc_device_iter_exit(iter); - kfree(iter); + if (iter) { + nfc_device_iter_exit(iter); + kfree(iter); + } return 0; }