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=-20.2 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=unavailable 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 4A486C636C9 for ; Mon, 19 Jul 2021 15:03:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2B241611ED for ; Mon, 19 Jul 2021 15:03:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242671AbhGSOWS (ORCPT ); Mon, 19 Jul 2021 10:22:18 -0400 Received: from mail.kernel.org ([198.145.29.99]:55944 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242302AbhGSOU0 (ORCPT ); Mon, 19 Jul 2021 10:20:26 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 7C9A06024A; Mon, 19 Jul 2021 15:00:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626706858; bh=JVs+USAqbQwyWosver9IEvaSkLoC7t8CAAanoNskeOs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JFgkJS537Qm/NmBoJ9zpaGmpseXZffyHqTn5MN83eo5Z8ZdxzUui6ay1gCwIXgfX0 7ZhyId4ARs4Odcglk6v2DF/doSF/nhZU1Q/2m0Jgq9DXTgZPVN01hVdYddUU1PHH3U OCGHqBf5KcNmYclFUa9R10JehMQBlEA9U4JDbP9Y= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Lee Gibson , Kalle Valo , Sasha Levin Subject: [PATCH 4.4 111/188] wl1251: Fix possible buffer overflow in wl1251_cmd_scan Date: Mon, 19 Jul 2021 16:51:35 +0200 Message-Id: <20210719144939.003177231@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210719144913.076563739@linuxfoundation.org> References: <20210719144913.076563739@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: linux-kernel@vger.kernel.org From: Lee Gibson [ Upstream commit d10a87a3535cce2b890897914f5d0d83df669c63 ] Function wl1251_cmd_scan calls memcpy without checking the length. Harden by checking the length is within the maximum allowed size. Signed-off-by: Lee Gibson Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20210428115508.25624-1-leegib@gmail.com Signed-off-by: Sasha Levin --- drivers/net/wireless/ti/wl1251/cmd.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/ti/wl1251/cmd.c b/drivers/net/wireless/ti/wl1251/cmd.c index ede31f048ef9..247f4310a38f 100644 --- a/drivers/net/wireless/ti/wl1251/cmd.c +++ b/drivers/net/wireless/ti/wl1251/cmd.c @@ -465,9 +465,12 @@ int wl1251_cmd_scan(struct wl1251 *wl, u8 *ssid, size_t ssid_len, cmd->channels[i].channel = channels[i]->hw_value; } - cmd->params.ssid_len = ssid_len; - if (ssid) - memcpy(cmd->params.ssid, ssid, ssid_len); + if (ssid) { + int len = clamp_val(ssid_len, 0, IEEE80211_MAX_SSID_LEN); + + cmd->params.ssid_len = len; + memcpy(cmd->params.ssid, ssid, len); + } ret = wl1251_cmd_send(wl, CMD_SCAN, cmd, sizeof(*cmd)); if (ret < 0) { -- 2.30.2