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 D7EA4C433FE for ; Mon, 7 Mar 2022 10:04:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239833AbiCGKEw (ORCPT ); Mon, 7 Mar 2022 05:04:52 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50480 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241177AbiCGJl7 (ORCPT ); Mon, 7 Mar 2022 04:41:59 -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 2D2D1DE8A; Mon, 7 Mar 2022 01:41:06 -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 98ABFB810C6; Mon, 7 Mar 2022 09:36:04 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DA89FC340E9; Mon, 7 Mar 2022 09:36:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1646645763; bh=stdlv2J1UkzSjlsuBLGDoszBpm+lXxb2VHMR9D1vs1g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fCK73jG/EYtxYCdpOSeHC9GVTZLgqKZuL76YENH5zteWdtNGLKrypV2ZaHVyWwtXK 6zWX8ls1sxetRwcq0lbVawA7HwuvYnMNpnE3Jgxm1cjOFM8K2YomKLo9pI9R19R0Fp gQhWEyIHAsjsl/wJZ4RJREAX05iwOjUnigTSy8HQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alan Stern , Hangyu Hua Subject: [PATCH 5.15 028/262] usb: gadget: clear related members when goto fail Date: Mon, 7 Mar 2022 10:16:12 +0100 Message-Id: <20220307091703.163852605@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220307091702.378509770@linuxfoundation.org> References: <20220307091702.378509770@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: Hangyu Hua commit 501e38a5531efbd77d5c73c0ba838a889bfc1d74 upstream. dev->config and dev->hs_config and dev->dev need to be cleaned if dev_config fails to avoid UAF. Acked-by: Alan Stern Signed-off-by: Hangyu Hua Link: https://lore.kernel.org/r/20211231172138.7993-3-hbh25y@gmail.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/legacy/inode.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) --- a/drivers/usb/gadget/legacy/inode.c +++ b/drivers/usb/gadget/legacy/inode.c @@ -1878,8 +1878,8 @@ dev_config (struct file *fd, const char value = usb_gadget_probe_driver(&gadgetfs_driver); if (value != 0) { - kfree (dev->buf); - dev->buf = NULL; + spin_lock_irq(&dev->lock); + goto fail; } else { /* at this point "good" hardware has for the first time * let the USB the host see us. alternatively, if users @@ -1896,6 +1896,9 @@ dev_config (struct file *fd, const char return value; fail: + dev->config = NULL; + dev->hs_config = NULL; + dev->dev = NULL; spin_unlock_irq (&dev->lock); pr_debug ("%s: %s fail %zd, %p\n", shortname, __func__, value, dev); kfree (dev->buf);