From patchwork Mon Mar 15 13:54:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 401140 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=-19.0 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, 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 1C11CC28E86 for ; Mon, 15 Mar 2021 14:10:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0191664F76 for ; Mon, 15 Mar 2021 14:10:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235703AbhCOOKU (ORCPT ); Mon, 15 Mar 2021 10:10:20 -0400 Received: from mail.kernel.org ([198.145.29.99]:49118 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233847AbhCOOCb (ORCPT ); Mon, 15 Mar 2021 10:02:31 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 2671064EF3; Mon, 15 Mar 2021 14:02:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1615816951; bh=y936yeVlW7Axkpod6hrD2yfHxzmIRGBM0q+s8LL4oas=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FHkUsb1dPsNRf4LYV2ksoUkDnLf6I8S8lYBdbdbBfXoLEhFhKHodoTKz9KfQrAb5F WlR7Gh9BPIQ9EOdmzZPzD5XGR3OZOcVSNutBC+StRN8+B0pf9Y3dMpD6EcvRc16CVO VKK1f2kQlxsruFDoNxtdKMO2hNhVy6/sQ5WSYY+4= From: gregkh@linuxfoundation.org To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dan Carpenter Subject: [PATCH 5.11 223/306] staging: rtl8712: unterminated string leads to read overflow Date: Mon, 15 Mar 2021 14:54:46 +0100 Message-Id: <20210315135515.161594138@linuxfoundation.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210315135507.611436477@linuxfoundation.org> References: <20210315135507.611436477@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Greg Kroah-Hartman From: Dan Carpenter commit d660f4f42ccea50262c6ee90c8e7ad19a69fb225 upstream. The memdup_user() function does not necessarily return a NUL terminated string so this can lead to a read overflow. Switch from memdup_user() to strndup_user() to fix this bug. Fixes: c6dc001f2add ("staging: r8712u: Merging Realtek's latest (v2.6.6). Various fixes.") Cc: stable Signed-off-by: Dan Carpenter Link: https://lore.kernel.org/r/YDYSR+1rj26NRhvb@mwanda Signed-off-by: Greg Kroah-Hartman --- drivers/staging/rtl8712/rtl871x_ioctl_linux.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/staging/rtl8712/rtl871x_ioctl_linux.c +++ b/drivers/staging/rtl8712/rtl871x_ioctl_linux.c @@ -924,7 +924,7 @@ static int r871x_wx_set_priv(struct net_ struct iw_point *dwrq = (struct iw_point *)awrq; len = dwrq->length; - ext = memdup_user(dwrq->pointer, len); + ext = strndup_user(dwrq->pointer, len); if (IS_ERR(ext)) return PTR_ERR(ext);