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[75.142.250.213]) by smtp.gmail.com with ESMTPSA id s17sm13274100qta.26.2020.10.12.21.07.31 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 12 Oct 2020 21:07:32 -0700 (PDT) Subject: Re: [PATCH] ptp: ptp_clockmatrix: initialize variables To: Richard Cochran Cc: natechancellor@gmail.com, ndesaulniers@google.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com References: <20201011200955.29992-1-trix@redhat.com> <20201012220126.GB1310@hoboy> From: Tom Rix Message-ID: <05da63b8-f1f5-9195-d156-0f2e7f3ea116@redhat.com> Date: Mon, 12 Oct 2020 21:07:30 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 In-Reply-To: <20201012220126.GB1310@hoboy> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/12/20 3:01 PM, Richard Cochran wrote: > On Sun, Oct 11, 2020 at 01:09:55PM -0700, trix@redhat.com wrote: >> From: Tom Rix >> >> Clang static analysis reports this representative problem >> >> ptp_clockmatrix.c:1852:2: warning: 5th function call argument >> is an uninitialized value >> snprintf(idtcm->version, sizeof(idtcm->version), "%u.%u.%u", >> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >> >> idtcm_display_version_info() calls several idtcm_read_*'s without >> checking a return status. > So why not check the return status? calling function is a print information only function that returns void. I do think not adding error handling is worth it. I could change the return and then the calls if if you like. Tom > > Your patch papers over the issue. > > Thanks, > Richard >