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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-43bd4291ffbsm18687465e9.15.2025.03.05.06.17.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Mar 2025 06:17:33 -0800 (PST) Date: Wed, 5 Mar 2025 14:17:32 +0000 From: David Laight To: Dan Carpenter Cc: Markus Elfring , Dmitry Baryshkov , kernel-janitors@vger.kernel.org, freedreno@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, Abhinav Kumar , Archit Taneja , Daniel Vetter , David Airlie , Jeykumar Sankaran , Jordan Crouse , Marijn Suijten , Rob Clark , Sean Paul , Simona Vetter , Vinod Koul , cocci@inria.fr, LKML Message-ID: <20250305141732.26b91742@pumpkin> In-Reply-To: <4c489b64-4c25-43e3-90d3-37f2f335d665@stanley.mountain> References: <40c60719-4bfe-b1a4-ead7-724b84637f55@web.de> <1a11455f-ab57-dce0-1677-6beb8492a257@web.de> <13566308-9a80-e4aa-f64e-978c02b1406d@web.de> <54c30a69-71cf-4582-9086-50eb0d39f273@web.de> <29b32b0d-312d-4848-9e26-9e5e76e527a7@stanley.mountain> <4c489b64-4c25-43e3-90d3-37f2f335d665@stanley.mountain> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Validation-by: victor.gambier@inria.fr Subject: Re: [cocci] [RFC] Clarification for =?UTF-8?Q?=E2=80=9Cundefined_?= =?UTF-8?Q?behaviour=E2=80=9D=3F?= Reply-To: David Laight X-Loop: cocci@inria.fr X-Sequence: 2556 Errors-To: cocci-owner@inria.fr Precedence: list Precedence: bulk Sender: cocci-request@inria.fr X-no-archive: yes List-Id: List-Help: List-Subscribe: List-Unsubscribe: List-Post: List-Owner: List-Archive: Archived-At: On Wed, 5 Mar 2025 11:51:59 +0300 Dan Carpenter wrote: > On Wed, Mar 05, 2025 at 09:40:43AM +0100, Markus Elfring wrote: > > >>> The address of a data structure member was determined before > > >>> a corresponding null pointer check in the implementation of > > >>> the functions =E2=80=9Cdpu_hw_pp_enable_te=E2=80=9D and =E2=80=9Cdp= u_hw_pp_get_vsync_info=E2=80=9D. > > >>> > > >>> Thus avoid the risk for undefined behaviour by removing extra > > >>> initialisations for the variable =E2=80=9Cc=E2=80=9D (also because = it was already > > >>> reassigned with the same value behind this pointer check). =20 > > > There is no undefined behavior here. =20 > >=20 > > Is there a need to improve the wording precision? > >=20 > > There are words which denote a special meaning according to aspects of > > the programming language =E2=80=9CC=E2=80=9D. > > https://en.cppreference.com/w/c/language/behavior > >=20 > > Dereferences of null pointers are treated in special ways. =20 >=20 > This not a dereference. It's just pointer math. And the 'fun' starts because NULL isn't required to use the all-zero bit pattern. Regardless of the bit-pattern, things like (void *)(1 - 1) are valid NULL pointers. Of course, while C allows this, I doubt NULL has ever been other than 0. (It was 0 on a system I used many years ago where the O/S invalid pointer was ~0.) I know Clang has started warning about arithmetic on NULL. I wonder when it is going to start warning about memset(p, 0, sz) for anything that contains a pointer - equally invalid. 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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-43bd4291ffbsm18687465e9.15.2025.03.05.06.17.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Mar 2025 06:17:33 -0800 (PST) Date: Wed, 5 Mar 2025 14:17:32 +0000 From: David Laight To: Dan Carpenter Cc: Markus Elfring , Dmitry Baryshkov , kernel-janitors@vger.kernel.org, freedreno@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, Abhinav Kumar , Archit Taneja , Daniel Vetter , David Airlie , Jeykumar Sankaran , Jordan Crouse , Marijn Suijten , Rob Clark , Sean Paul , Simona Vetter , Vinod Koul , cocci@inria.fr, LKML Subject: Re: [RFC] Clarification for =?UTF-8?B?4oCcdW5kZWZpbmVkIGJlaGF2?= =?UTF-8?B?aW91cuKAnT8=?= Message-ID: <20250305141732.26b91742@pumpkin> In-Reply-To: <4c489b64-4c25-43e3-90d3-37f2f335d665@stanley.mountain> References: <40c60719-4bfe-b1a4-ead7-724b84637f55@web.de> <1a11455f-ab57-dce0-1677-6beb8492a257@web.de> <13566308-9a80-e4aa-f64e-978c02b1406d@web.de> <54c30a69-71cf-4582-9086-50eb0d39f273@web.de> <29b32b0d-312d-4848-9e26-9e5e76e527a7@stanley.mountain> <4c489b64-4c25-43e3-90d3-37f2f335d665@stanley.mountain> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) Precedence: bulk X-Mailing-List: kernel-janitors@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Wed, 5 Mar 2025 11:51:59 +0300 Dan Carpenter wrote: > On Wed, Mar 05, 2025 at 09:40:43AM +0100, Markus Elfring wrote: > > >>> The address of a data structure member was determined before > > >>> a corresponding null pointer check in the implementation of > > >>> the functions =E2=80=9Cdpu_hw_pp_enable_te=E2=80=9D and =E2=80=9Cdp= u_hw_pp_get_vsync_info=E2=80=9D. > > >>> > > >>> Thus avoid the risk for undefined behaviour by removing extra > > >>> initialisations for the variable =E2=80=9Cc=E2=80=9D (also because = it was already > > >>> reassigned with the same value behind this pointer check). =20 > > > There is no undefined behavior here. =20 > >=20 > > Is there a need to improve the wording precision? > >=20 > > There are words which denote a special meaning according to aspects of > > the programming language =E2=80=9CC=E2=80=9D. > > https://en.cppreference.com/w/c/language/behavior > >=20 > > Dereferences of null pointers are treated in special ways. =20 >=20 > This not a dereference. It's just pointer math. And the 'fun' starts because NULL isn't required to use the all-zero bit pattern. Regardless of the bit-pattern, things like (void *)(1 - 1) are valid NULL pointers. Of course, while C allows this, I doubt NULL has ever been other than 0. (It was 0 on a system I used many years ago where the O/S invalid pointer was ~0.) I know Clang has started warning about arithmetic on NULL. I wonder when it is going to start warning about memset(p, 0, sz) for anything that contains a pointer - equally invalid. David