From nobody Fri Sep 5 20:06:17 2025 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 C312AC32772 for ; Tue, 23 Aug 2022 11:23:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347967AbiHWLXr (ORCPT ); Tue, 23 Aug 2022 07:23:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37526 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241951AbiHWLRr (ORCPT ); Tue, 23 Aug 2022 07:17:47 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 43952895F9; Tue, 23 Aug 2022 02:21:36 -0700 (PDT) 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 dfw.source.kernel.org (Postfix) with ESMTPS id D0FAC61220; Tue, 23 Aug 2022 09:21:35 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C15FBC433C1; Tue, 23 Aug 2022 09:21:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1661246495; bh=uoFE8oGaUsPJ3bxls2g9OR4IgXa0uy5KyVqAX9KPPJ8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=zVfwOpkibyUO4ayILGZsNBBNJvu5gkW0S77NkgYQJw2GIPgutarU+zjZ5I5NEzvT3 PiGHDMokD5MmJP5/ZUctnLwdwo1qGu6JUQ/ggPSH6EdFxfb6JFnsH/17qO0U8LSrvj 6I0Ncmi2aX7xYCCmBc1iS32Nu+lqH6K5Unrpb2YQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dan Carpenter , Kalle Valo , Sasha Levin Subject: [PATCH 5.4 127/389] wifi: wil6210: debugfs: fix info leak in wil_write_file_wmi() Date: Tue, 23 Aug 2022 10:23:25 +0200 Message-Id: <20220823080120.927459898@linuxfoundation.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220823080115.331990024@linuxfoundation.org> References: <20220823080115.331990024@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Dan Carpenter [ Upstream commit 7a4836560a6198d245d5732e26f94898b12eb760 ] The simple_write_to_buffer() function will succeed if even a single byte is initialized. However, we need to initialize the whole buffer to prevent information leaks. Just use memdup_user(). Fixes: ff974e408334 ("wil6210: debugfs interface to send raw WMI command") Signed-off-by: Dan Carpenter Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/Ysg14NdKAZF/hcNG@kili Signed-off-by: Sasha Levin --- drivers/net/wireless/ath/wil6210/debugfs.c | 14 ++++---------- 1 file changed, 4 insertions(+), 10 deletions(-) diff --git a/drivers/net/wireless/ath/wil6210/debugfs.c b/drivers/net/wirel= ess/ath/wil6210/debugfs.c index 304b4d4e506a..b82af3a49912 100644 --- a/drivers/net/wireless/ath/wil6210/debugfs.c +++ b/drivers/net/wireless/ath/wil6210/debugfs.c @@ -1023,18 +1023,12 @@ static ssize_t wil_write_file_wmi(struct file *file= , const char __user *buf, u16 cmdid; int rc, rc1; =20 - if (cmdlen < 0) + if (cmdlen < 0 || *ppos !=3D 0) return -EINVAL; =20 - wmi =3D kmalloc(len, GFP_KERNEL); - if (!wmi) - return -ENOMEM; - - rc =3D simple_write_to_buffer(wmi, len, ppos, buf, len); - if (rc < 0) { - kfree(wmi); - return rc; - } + wmi =3D memdup_user(buf, len); + if (IS_ERR(wmi)) + return PTR_ERR(wmi); =20 cmd =3D (cmdlen > 0) ? &wmi[1] : NULL; cmdid =3D le16_to_cpu(wmi->command_id); --=20 2.35.1