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=-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 4D8CDC2BA2B for ; Mon, 15 Mar 2021 14:10:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 34EE864F3C for ; Mon, 15 Mar 2021 14:10:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235716AbhCOOKa (ORCPT ); Mon, 15 Mar 2021 10:10:30 -0400 Received: from mail.kernel.org ([198.145.29.99]:49172 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233913AbhCOOCg (ORCPT ); Mon, 15 Mar 2021 10:02:36 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 5B79064EED; Mon, 15 Mar 2021 14:02:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1615816956; bh=YbbD2OM49azgxz1waoAEtRW/HfYSxogBZ1pRKo4eEYc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ew6Hh00WkJiw1BeMr0y9EJy8s2M64NveyWq8f3ZnH9BnrD+hbWu30BJj1AG/yTMoK 9H9UYbURDboFZdmhfMOkexNRtfCttTmdlOrnL2YltdweFLI+eIcOk8WZk1+/FyolbP 8/z3JPHvXADgWQhy3dP3+S6VNo1Ei6fAMkIBZpAY= From: gregkh@linuxfoundation.org To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dan Carpenter , Lee Gibson Subject: [PATCH 5.11 227/306] staging: rtl8192e: Fix possible buffer overflow in _rtl92e_wx_set_scan Date: Mon, 15 Mar 2021 14:54:50 +0100 Message-Id: <20210315135515.294944748@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 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Greg Kroah-Hartman From: Lee Gibson commit 8687bf9ef9551bcf93897e33364d121667b1aadf upstream. Function _rtl92e_wx_set_scan calls memcpy without checking the length. A user could control that length and trigger a buffer overflow. Fix by checking the length is within the maximum allowed size. Reviewed-by: Dan Carpenter Signed-off-by: Lee Gibson Cc: stable Link: https://lore.kernel.org/r/20210226145157.424065-1-leegib@gmail.com Signed-off-by: Greg Kroah-Hartman --- drivers/staging/rtl8192e/rtl8192e/rtl_wx.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) --- a/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c +++ b/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c @@ -406,9 +406,10 @@ static int _rtl92e_wx_set_scan(struct ne 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); } }