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 A1C90C43334 for ; Fri, 3 Jun 2022 17:48:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345336AbiFCRsJ (ORCPT ); Fri, 3 Jun 2022 13:48:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45560 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345251AbiFCRsD (ORCPT ); Fri, 3 Jun 2022 13:48:03 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A701357179; Fri, 3 Jun 2022 10:44:30 -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 ams.source.kernel.org (Postfix) with ESMTPS id 54F2FB82436; Fri, 3 Jun 2022 17:44:29 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BD5D4C385A9; Fri, 3 Jun 2022 17:44:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1654278268; bh=JwRn3piZByy6d3OEljMZ0zRxdm1NyDdxdF436yhUpcQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=j78zxaWy9mhr8NO8wkaIcl2FwAK1qpJVde/w7ZPgbgLYxHQxnxdUdGkl9wn8/KPtf iGnIHixFVYpDVfCk6KEPZWo0QpuOIZGW8rAtkCgCqAkVXiZVOW7NM8qOoJlJveU37t FB24kf3tWaB/BoRAhvOGpQGww1PRKVc6wjVOp/E8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Denis Efremov (Oracle)" Subject: [PATCH 5.4 03/34] staging: rtl8723bs: prevent ->Ssid overflow in rtw_wx_set_scan() Date: Fri, 3 Jun 2022 19:42:59 +0200 Message-Id: <20220603173816.091930554@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220603173815.990072516@linuxfoundation.org> References: <20220603173815.990072516@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: "Denis Efremov (Oracle)" This code has a check to prevent read overflow but it needs another check to prevent writing beyond the end of the ->Ssid[] array. Fixes: 554c0a3abf21 ("staging: Add rtl8723bs sdio wifi driver") Cc: stable Signed-off-by: Denis Efremov (Oracle) Signed-off-by: Greg Kroah-Hartman --- drivers/staging/rtl8723bs/os_dep/ioctl_linux.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c +++ b/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c @@ -1351,9 +1351,11 @@ static int rtw_wx_set_scan(struct net_de sec_len = *(pos++); len-= 1; - if (sec_len>0 && sec_len<=len) { + if (sec_len > 0 && + sec_len <= len && + sec_len <= 32) { ssid[ssid_index].SsidLength = sec_len; - memcpy(ssid[ssid_index].Ssid, pos, ssid[ssid_index].SsidLength); + memcpy(ssid[ssid_index].Ssid, pos, sec_len); /* DBG_871X("%s COMBO_SCAN with specific ssid:%s, %d\n", __func__ */ /* , ssid[ssid_index].Ssid, ssid[ssid_index].SsidLength); */ ssid_index++;