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Thu, 09 Nov 2023 12:02:16 -0800 (PST) X-Google-Smtp-Source: AGHT+IEz1sgZpcnh20EM0GcDblsfxeXjerkcic/JFKSIz2HIupNW1ZmhN8Je3XlAW7sqHaM4aU/sVg== X-Received: by 2002:a17:907:9304:b0:9cf:7d6c:aa72 with SMTP id bu4-20020a170907930400b009cf7d6caa72mr4464531ejc.2.1699560136342; Thu, 09 Nov 2023 12:02:16 -0800 (PST) Received: from [10.0.0.168] ([37.186.169.33]) by smtp.gmail.com with ESMTPSA id x23-20020a170906299700b009ae587ce133sm2918725eje.188.2023.11.09.12.02.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Nov 2023 12:02:14 -0800 (PST) Message-ID: <1640d32bb9f5d25868c30c14cbb1074c3be7cbb3.camel@redhat.com> Subject: Re: [PATCH nft v2 0/4] [RESENT] remove xfree() and add free_const()+nft_gmp_free() From: Thomas Haller To: Pablo Neira Ayuso Cc: NetFilter Date: Thu, 09 Nov 2023 21:02:14 +0100 In-Reply-To: References: <20231024095820.1068949-1-thaller@redhat.com> <76fee659f586988888d1805c5a69627dda5c4f03.camel@redhat.com> Autocrypt: addr=thaller@redhat.com; prefer-encrypt=mutual; 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charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.0 (3.50.0-1.fc39) MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netfilter-devel@vger.kernel.org On Thu, 2023-11-09 at 20:15 +0100, Pablo Neira Ayuso wrote: > On Thu, Nov 09, 2023 at 06:14:56PM +0100, Thomas Haller wrote: > > On Thu, 2023-11-09 at 17:05 +0100, Pablo Neira Ayuso wrote: > [...] > > > I might end up myself using > > > free_const() everywhere not to figure out if it is const or not, > > > because I don't really care. > >=20 > > That seems not a good practice. Const-correctness may help you to > > catch > > bugs via unwanted modifications. If constness is unnecessarily cast > > away, it's looses such hints from the compiler. >=20 > Why should I care if the pointer is const or not if what I need to > free it? There might be a mistake/bug, and the thing should not actually be freed. We need every help from the compiler we can get (compiler warnings, strong typing/const-correctness, static assertions). Normally, the compiler would help and complain against free() of a const pointer. With xfree()/free_const() used eagerly, it does not help. Thomas