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 1087FC64E68 for ; Mon, 19 Jul 2021 16:22:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 07A756140A for ; Mon, 19 Jul 2021 16:22:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241899AbhGSPk5 (ORCPT ); Mon, 19 Jul 2021 11:40:57 -0400 Received: from mail.kernel.org ([198.145.29.99]:53370 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344362AbhGSO7f (ORCPT ); Mon, 19 Jul 2021 10:59:35 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id B54746121F; Mon, 19 Jul 2021 15:40:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626709201; bh=DLMSh4j0AnmTMlzgxM/VboZ7+8wm4ULFHQ39d2I+ppE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ht5EoSE80d+gHfjGco5mXNIXScS6mM0DpFxI0LLjqA4V5EXAdRVI+rLcBauYwvrWO S75W11hfAP3Sdp3uy5sDZc6O9Q8mvqEbGqkM/2YgUaJx36vDUuvzFOuSmTWUDcf8VA k4kxMSH4zgScaB7KjEnkk4McshEpcDywVDDAP8GA= 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 4.19 256/421] wl1251: Fix possible buffer overflow in wl1251_cmd_scan Date: Mon, 19 Jul 2021 16:51:07 +0200 Message-Id: <20210719144955.269194129@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210719144946.310399455@linuxfoundation.org> References: <20210719144946.310399455@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 9547aea01b0f..ea0215246c5c 100644 --- a/drivers/net/wireless/ti/wl1251/cmd.c +++ b/drivers/net/wireless/ti/wl1251/cmd.c @@ -466,9 +466,12 @@ 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