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=-10.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 313EBC35280 for ; Mon, 30 Sep 2019 14:02:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 12E2F20842 for ; Mon, 30 Sep 2019 14:02:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731476AbfI3OCZ (ORCPT ); Mon, 30 Sep 2019 10:02:25 -0400 Received: from mail-wr1-f68.google.com ([209.85.221.68]:33350 "EHLO mail-wr1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730524AbfI3OCY (ORCPT ); Mon, 30 Sep 2019 10:02:24 -0400 Received: by mail-wr1-f68.google.com with SMTP id b9so11513358wrs.0; Mon, 30 Sep 2019 07:02:22 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=7wr4aVdaxbEMv/UX7nqpmCIH8uVZ65LnsbgEKWRrbhc=; b=RtpRwsDwr1LTPoUq5NUM+nrpO63VDB1OLtLqQP7qiOq+hIhz/UcRSEGmSbXxAtwsjE J3UWgjASH3/BrHk1TMxdacLaOBoktTsDOEtn7Bc3RTkw3otK69yq577gHe5zj2TL3RYl qPjcCJnVjNslaG/FPUKEB17jbDRVyBOJvJ6eCwGa/TPf54WVCKZoEsEFQm1ffBy50sPe SfoEkzVC9OjnUwkRAL+b6XHHa26ITQYP5fkZqK7WtJKYhIKcOj+mRnjZOuAKp58vnEeJ +pfoxMcCxVjb0Y+T0v9tax75iJHH0nftbeEe4ih3Odgw7hvF0lld2FXmxbux0mGEeffJ 3Gmg== X-Gm-Message-State: APjAAAXE4cLZ2KsXFJtau9qgz9t7dKlbQeZYKtsQGDelB4XIUDB6bY/j DKaP6403EQI4pZfbxk7q7UlpAntC X-Google-Smtp-Source: APXvYqxiiFMzv3srbGQK/zZY+ci87zR844eKxu3fL2x+CU3Oy0tDmHDfI0I4XxcXHe1hilTCqog5ug== X-Received: by 2002:adf:b648:: with SMTP id i8mr12771912wre.372.1569852142160; Mon, 30 Sep 2019 07:02:22 -0700 (PDT) Received: from green.intra.ispras.ru (bran.ispras.ru. [83.149.199.196]) by smtp.googlemail.com with ESMTPSA id x129sm20494089wmg.8.2019.09.30.07.02.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 30 Sep 2019 07:02:21 -0700 (PDT) From: Denis Efremov To: linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Denis Efremov , Pontus Fuchs , Kalle Valo , "David S. Miller" , stable@vger.kernel.org Subject: [PATCH] ar5523: check NULL before memcpy() in ar5523_cmd() Date: Mon, 30 Sep 2019 17:02:07 +0300 Message-Id: <20190930140207.28638-1-efremov@linux.com> X-Mailer: git-send-email 2.21.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org memcpy() call with "idata == NULL && ilen == 0" results in undefined behavior in ar5523_cmd(). For example, NULL is passed in callchain "ar5523_stat_work() -> ar5523_cmd_write() -> ar5523_cmd()". This patch adds idata check before memcpy() call in ar5523_cmd() to prevent an undefined behavior. Cc: Pontus Fuchs Cc: Kalle Valo Cc: "David S. Miller" Cc: stable@vger.kernel.org Signed-off-by: Denis Efremov --- drivers/net/wireless/ath/ar5523/ar5523.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/ath/ar5523/ar5523.c b/drivers/net/wireless/ath/ar5523/ar5523.c index b94759daeacc..f25af5bc5282 100644 --- a/drivers/net/wireless/ath/ar5523/ar5523.c +++ b/drivers/net/wireless/ath/ar5523/ar5523.c @@ -255,7 +255,8 @@ static int ar5523_cmd(struct ar5523 *ar, u32 code, const void *idata, if (flags & AR5523_CMD_FLAG_MAGIC) hdr->magic = cpu_to_be32(1 << 24); - memcpy(hdr + 1, idata, ilen); + if (idata) + memcpy(hdr + 1, idata, ilen); cmd->odata = odata; cmd->olen = olen; -- 2.21.0