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Tue, 24 Dec 2024 17:10:04 +0100 Message-ID: <8a5bdda5-5e2a-4b73-91a5-849b6060e7df@web.de> Date: Tue, 24 Dec 2024 17:09:54 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird To: Karan Sanghavi , dri-devel@lists.freedesktop.org, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Alexandre Mergnat , Angelo Gioacchino Del Regno , Chun-Kuang Hu , David Airlie , Matthias Brugger , Philipp Zabel , Shuah Khan , Simona Vetter , Sui Jingfeng Cc: LKML , =?UTF-8?B?Q0sgSHUgKOiDoeS/iuWFiSk=?= References: <20241111-uninitializedpointer1601557-v1-1-7d03668e8141@gmail.com> Subject: Re: [PATCH] drm/mediatek: Initialize pointer before use to avoid undefiend behaviour Content-Language: en-GB From: Markus Elfring In-Reply-To: <20241111-uninitializedpointer1601557-v1-1-7d03668e8141@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:wwXFHOL+rndON19bU3EG1IfLGvHbJBJd7inIjYIugf2NhmMqb6U R1R/rBD0UHK6pwy8zk/7+GIdiHvkKvjOModfkb8guBPJRxivUtwnYcmZa1F52pt2rKs4Azo Yi2DjvLpUxcdCUxxZBA3iUnW7f9QPiIPeN1+1cPzc0FURyi1o+iSu4nYhFKkjpA6p/jviB4 kfZJbrzroQ0B+VkBQ64xw== UI-OutboundReport: notjunk:1;M01:P0:S5pLRWNHLTE=;HrTXFPU0JfRlQkwFTtq5Qx0G2G2 CgQITP+3XJiTSrnPMN2AlRwj2LqbNwD5JcJCPMKzIS/obzPrOI5k0aHDcTgfjdu0FvJa+RIr+ Yur4nIMJn4cobWbh56rVUPSrbs4KkYD3cOyg7EMcxZkyDZZVlCe662fUGE1s7rdtxnPQMVL2q tts9CRn98fVYT3ptoGG6yT6mc7LsXaFtEzl4i0yfnvsQ4XA7wVVQ/ntl0pMZXQKZHCA3wI6MP IyXCZTaVGA5qZc8ANSsv6GIC1YLEtLttG8CyRLrWoHTGoztdRFlVRdLUZloAzKxlZFHR298FZ 4E+irVczPijupiXScpqUs+Bh26Hr4RPrKD7edmWh3JdwHsadOgrV8o75SZS2SVD8bxRkLaLoV zkEtmSDWXHv3gWq44xUvC4HQEh8FkVJ6jIQ29CXZGz+coyBlIy09RxN/UGZQ87esiuAMKfqKR oSiwuuSjxXC7js+MnT5bILFMGPPJC7A1/aBPveJLHYbnp0VfgBLPovHx47SqjZbtXiKSdWQkD R5Bp22OR45mDuE70xFpmrApS5IWSUlEoxRZ1642c9qXoD0i+RAfr6Wdc2t//Trs6IocFh+WUk dcerWb4i3X1lgEe1XVrhW0FgPloaEBwrcKvS6jpnWtAdkPs7KY7aTNAuMgMNqUjhgNrBWsU1O 4gpNJ1y1xuqGOUkAFFTIdLi6SRh1Byqvj9LgyfBFk2FUC0J4IMFTN99d85wMK1AyjH0r98b09 xb3x/VX/hnnbgUE1Oxcsg91m0QLtkR+pagUxaZ/Cqw89fv3qNzyi130hQA2x/8q2zdsQG7Xwg 4edJU93UOJQnMHYKIGH1VaMlS+127uQfsNeHCoYZOANymM1oOUWjDTv3MF3dyU62ODNSR6q3A 0oYSVFfqSz3aPfvCV3hQ3frllZmNjiR5VD91WC8UeHrq8GaeyfGl5o6R+tfhNkKJuqG8a5ST8 BqVJXrQ4+wfdEkgJWQ+871Ok9G6nE+oKnb7Wh98NDjsVUwqKp81zMkBnpwzDmzIqqvBRx5duK t24gcuhVSL6BtEqOKgcL8/dkRVhFCn22sMsEehyrhlo2qRhNpmcqvTsuB17U141wVmo/uP9c3 RZ7PUS6xc= X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241224_081009_621622_473BC6EF X-CRM114-Status: UNSURE ( 5.70 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org > Initialize the pointer with NULL as mtk_drm_of_get_ddp_ep_cid > function might return before assigning value to next pointer > but yet further dereference to next can lead to some undefined > behavior as it may point to some invalid location. * You may occasionally put more than 62 characters into text lines of such a change description. * Please avoid a typo the summary phrase. =E2=80=A6 > --- > Coverity Message: > CID 1601557: (#1 of 1): Uninitialized pointer read (UNINIT) > 3. uninit_use: Using uninitialized value next. May such information become a part for the final change description? Regards, Markus