From patchwork Mon Mar 15 13:51:57 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 401629 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 6C658C4332E for ; Mon, 15 Mar 2021 13:55:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5038E64EE3 for ; Mon, 15 Mar 2021 13:55:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231233AbhCONyl (ORCPT ); Mon, 15 Mar 2021 09:54:41 -0400 Received: from mail.kernel.org ([198.145.29.99]:57146 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231232AbhCONx5 (ORCPT ); Mon, 15 Mar 2021 09:53:57 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id EE58A64EB6; Mon, 15 Mar 2021 13:53:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1615816437; bh=jnyP4GWxRl0BtFPVXYC88d9eUBnT4IJZlOB5QQ4qsF4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=L+gehH+qbz1KJTSh3pb/+yxYlJfcE+qbSPJ6WzWYwnPIi8gODIfxNp8Nkr8glq9z/ 5rCzyqqjURjxO/LznNqZ2XINuEpVrZ+zxtm1OCi4POdGhlVZ44XS5FmO0b1LO/I98H DD9Qs/DKuJhh+W3S16j3W/O0ml4wTbSQbKcNoY6E= From: gregkh@linuxfoundation.org To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dan Carpenter Subject: [PATCH 4.4 43/75] staging: rtl8192u: fix ->ssid overflow in r8192_wx_set_scan() Date: Mon, 15 Mar 2021 14:51:57 +0100 Message-Id: <20210315135209.660960848@linuxfoundation.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210315135208.252034256@linuxfoundation.org> References: <20210315135208.252034256@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 87107518d7a93fec6cdb2559588862afeee800fb upstream. We need to cap len at IW_ESSID_MAX_SIZE (32) to avoid memory corruption. This can be controlled by the user via the ioctl. Fixes: 5f53d8ca3d5d ("Staging: add rtl8192SU wireless usb driver") Signed-off-by: Dan Carpenter Cc: stable Link: https://lore.kernel.org/r/YEHoAWMOSZBUw91F@mwanda Signed-off-by: Greg Kroah-Hartman --- drivers/staging/rtl8192u/r8192U_wx.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/drivers/staging/rtl8192u/r8192U_wx.c +++ b/drivers/staging/rtl8192u/r8192U_wx.c @@ -341,8 +341,10 @@ static int r8192_wx_set_scan(struct net_ struct iw_scan_req *req = (struct iw_scan_req *)b; if (req->essid_len) { - ieee->current_network.ssid_len = req->essid_len; - memcpy(ieee->current_network.ssid, req->essid, req->essid_len); + int len = min_t(int, req->essid_len, IW_ESSID_MAX_SIZE); + + ieee->current_network.ssid_len = len; + memcpy(ieee->current_network.ssid, req->essid, len); } }