netdev - re: iwlwifi: refactor the SAR tables from mvm to acpi

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Message-ID: <18ea9fa8-93fe-f371-68ee-3d12eac252c8@canonical.com>
Date:   Fri, 20 Dec 2019 00:02:08 +0000
From:   Colin Ian King <colin.king@...onical.com>
To:     Johannes Berg <johannes.berg@...el.com>,
        Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
        Luca Coelho <luciano.coelho@...el.com>,
        Intel Linux Wireless <linuxwifi@...el.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Ihab Zhaika <ihab.zhaika@...el.com>,
        Shahar S Matityahu <shahar.s.matityahu@...el.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: re: iwlwifi: refactor the SAR tables from mvm to acpi

Hi,

Static analysis with Coverity has detected a potential issue with the
following commit:

commit 39c1a9728f938c7255ce507c8d56b73e8a4ebddf
Author: Ihab Zhaika <ihab.zhaika@...el.com>
Date:   Fri Nov 15 09:28:11 2019 +0200

    iwlwifi: refactor the SAR tables from mvm to acpi


in function iwl_sar_get_ewrd_table() we have an array index pos being
initialized to 3 and then incremented each time a loop iterates:

        for (i = 0; i < n_profiles; i++) {
                /* the tables start at element 3 */
                int pos = 3;

                /* The EWRD profiles officially go from 2 to 4, but we
                 * save them in sar_profiles[1-3] (because we don't
                 * have profile 0).  So in the array we start from 1.
                 */
                ret = iwl_sar_set_profile(&wifi_pkg->package.elements[pos],
                                          &fwrt->sar_profiles[i + 1],
                                          enabled);
                if (ret < 0)
                        break;

                /* go to the next table */
                pos += ACPI_SAR_TABLE_SIZE;
        }

So, each iteration is always accessing package.elements[3]. I'm not sure
if that is intentional. If it is, then the increment of pos is not
required.  Either way, it's not clear what the original intention is.

Colin