From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-lf1-f44.google.com (mail-lf1-f44.google.com [209.85.167.44]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 54ACB7C for ; Sun, 3 Apr 2022 11:20:12 +0000 (UTC) Received: by mail-lf1-f44.google.com with SMTP id k21so12416641lfe.4 for ; Sun, 03 Apr 2022 04:20:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=message-id:date:mime-version:user-agent:subject:content-language:to :cc:references:from:in-reply-to:content-transfer-encoding; bh=/nGCKkYfJckWjtQDHrGmqAfeKE621bI4+5SiFBLzr8w=; b=P4yB+NzYokpaQuk5EcyxPKue0k3iutinq/kqDEo62aZP+OHjThk/HpKhqNAbOGAr/f f+hybWpSpNr5Y2fAAC/G2HHq2MilW2isdChwE0L4fPwgHCQAvnICccinWrfaUIO2cTVy +yrx3m8h0KNMCiuUt9GSaoQS8wPezgYPHnIv53yEbA7DtQ4W+UMOttRY9BJyEvBbLIsm 3qdvaE45RTuqlCNFhnrMsLwM848MbZoeSyR6kLMu/gnRsBtgJLb9x62rFoahc3RCZcQU UdYGQpd97ZzUJmB9RyojxvABjMxboI9fiNMhX4dzxXdlO1IuFET6SikbKz6X+RIB59pM hjbg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:date:mime-version:user-agent:subject :content-language:to:cc:references:from:in-reply-to :content-transfer-encoding; bh=/nGCKkYfJckWjtQDHrGmqAfeKE621bI4+5SiFBLzr8w=; b=Qez+GPSUrbDS9gTqcxe0rTRZlCdAoSKfhEMYKQn0sz5wrPJCuZW4CnMgjy8JUr1k+v p2TW5xw1tEt/EEI1eJQFdvK2vMfaXg2pWCP0omlyDD/U3hHSJEMFgc7W6QwuP8Ls8TPN 7HYFA8q8qL7KoA4FxBw6fqGjjErc97aU+bl2uob5Z8IGSaXDo8dKVD/99k8a6aUXbTvK F/OdHXTS54NW1mtoXR0vk0DNSALXB46SjxXMVz9tpZ9qqbkN0Xbl1dMg2Cdw7O3RhVic 9f61fqHEEbCmMRdigWyh/chr3HhDXnIsrKYIuPMxvPAS1OUOcVphYfuPWYHOK62XtpXR 5IVA== X-Gm-Message-State: AOAM533X9arI7ve1DE77ScXjEDTy+l7NJZCD3RnWapz+YYuuCzh0fOla 2cfqleGy+o9J5jia4YEyyhk= X-Google-Smtp-Source: ABdhPJwipfILAHh1MtoZP7KcMZajG5mHZyIdWjyutVWgLNiaRtxZUKmxZSlYuPYTkXtaQxv6zJzb7Q== X-Received: by 2002:a05:6512:3184:b0:44a:78f2:500b with SMTP id i4-20020a056512318400b0044a78f2500bmr19313093lfe.434.1648984810166; Sun, 03 Apr 2022 04:20:10 -0700 (PDT) Received: from [192.168.1.11] ([46.235.67.247]) by smtp.gmail.com with ESMTPSA id i13-20020a2e808d000000b0024b0d63079fsm482238ljg.50.2022.04.03.04.20.09 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 03 Apr 2022 04:20:09 -0700 (PDT) Message-ID: <8652baf2-212a-c843-fb69-f4fd4c216775@gmail.com> Date: Sun, 3 Apr 2022 14:20:08 +0300 Precedence: bulk X-Mailing-List: linux-staging@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.7.0 Subject: Re: [PATCH] staging: r8188eu: Fix unsafe memory access by memcmp. Content-Language: en-US To: Charlie Sands , gregkh@linuxfoundation.org Cc: Larry.Finger@lwfinger.net, phil@philpotter.co.uk, linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org References: From: Pavel Skripkin In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi Charlie, On 4/1/22 23:12, Charlie Sands wrote: > This patch fixes sparse warnings about the memcmp function unsafely > accessing userspace memory without first copying it to kernel space. > > Signed-off-by: Charlie Sands > --- > drivers/staging/r8188eu/os_dep/ioctl_linux.c | 20 ++++++++++++-------- > 1 file changed, 12 insertions(+), 8 deletions(-) > > diff --git a/drivers/staging/r8188eu/os_dep/ioctl_linux.c b/drivers/staging/r8188eu/os_dep/ioctl_linux.c > index 7df213856d66..1cfac1b27eb7 100644 > --- a/drivers/staging/r8188eu/os_dep/ioctl_linux.c > +++ b/drivers/staging/r8188eu/os_dep/ioctl_linux.c > @@ -3233,23 +3233,27 @@ static int rtw_p2p_get(struct net_device *dev, > struct iw_request_info *info, > union iwreq_data *wrqu, char *extra) > { > - if (!memcmp(wrqu->data.pointer, "status", 6)) { > + char wrqu_data_ptr[9]; > + if (copy_from_user(wrqu_data_ptr, wrqu->data.pointer, 9)) > + return 0; -EFAULT is standard return value in case of `copy_{to_from}_user` failure With regards, Pavel Skripkin