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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 E0116C76191 for ; Mon, 15 Jul 2019 14:29:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B916021530 for ; Mon, 15 Jul 2019 14:29:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563200953; bh=XekN5yNdI6d8WL9nQDronZerRlpkwx+eGTn6Je99fWg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=QL9aJM9Fb0jUK9hwp5SIOERvBOJJ/nZY2dl9BoGv5F+WaTtdv04oqJfC79P4mDOFp Fr1/TYKD98aMRj7y6YbhXR91ZS9Bs8y9AziTwpuKGAm7QNYxv5A+LaY6zib1h7CpR2 laGCj12iE7tWabqsfJYJzd8ug6kqxKHJyuN8LIQM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391527AbfGOO3L (ORCPT ); Mon, 15 Jul 2019 10:29:11 -0400 Received: from mail.kernel.org ([198.145.29.99]:40158 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391346AbfGOO3L (ORCPT ); Mon, 15 Jul 2019 10:29:11 -0400 Received: from sasha-vm.mshome.net (unknown [73.61.17.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 15E1120868; Mon, 15 Jul 2019 14:29:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563200950; bh=XekN5yNdI6d8WL9nQDronZerRlpkwx+eGTn6Je99fWg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=sdJKOrlX2Xb/5MQawwaEZGzsAmQ7uJeVzMmkqpwcBfN1Fo6imDWCUV5Shd7qlT/Tp TCMQoS3mUu8YFis5IVKGqI2oYyLN74um4vV4EvHBoXJaVBBHzp8Yf9cNe36MKHbO0G pjRi2JHs1/o/y5CCDywfZzxBYVsTwuUqvhP748gY= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Oliver Neukum , syzbot+26ec41e9f788b3eba396@syzkaller.appspotmail.com, Sean Young , Mauro Carvalho Chehab , Sasha Levin , linux-media@vger.kernel.org Subject: [PATCH AUTOSEL 4.14 008/105] media: dvb: usb: fix use after free in dvb_usb_device_exit Date: Mon, 15 Jul 2019 10:27:02 -0400 Message-Id: <20190715142839.9896-8-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190715142839.9896-1-sashal@kernel.org> References: <20190715142839.9896-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org From: Oliver Neukum [ Upstream commit 6cf97230cd5f36b7665099083272595c55d72be7 ] dvb_usb_device_exit() frees and uses the device name in that order. Fix by storing the name in a buffer before freeing it. Signed-off-by: Oliver Neukum Reported-by: syzbot+26ec41e9f788b3eba396@syzkaller.appspotmail.com Signed-off-by: Sean Young Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/media/usb/dvb-usb/dvb-usb-init.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/media/usb/dvb-usb/dvb-usb-init.c b/drivers/media/usb/dvb-usb/dvb-usb-init.c index 84308569e7dc..b3413404f91a 100644 --- a/drivers/media/usb/dvb-usb/dvb-usb-init.c +++ b/drivers/media/usb/dvb-usb/dvb-usb-init.c @@ -287,12 +287,15 @@ EXPORT_SYMBOL(dvb_usb_device_init); void dvb_usb_device_exit(struct usb_interface *intf) { struct dvb_usb_device *d = usb_get_intfdata(intf); - const char *name = "generic DVB-USB module"; + const char *default_name = "generic DVB-USB module"; + char name[40]; usb_set_intfdata(intf, NULL); if (d != NULL && d->desc != NULL) { - name = d->desc->name; + strscpy(name, d->desc->name, sizeof(name)); dvb_usb_exit(d); + } else { + strscpy(name, default_name, sizeof(name)); } info("%s successfully deinitialized and disconnected.", name); -- 2.20.1