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[68.103.222.6]) by smtp.gmail.com with ESMTPSA id a6sm400144oiw.44.2021.03.24.06.58.27 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 24 Mar 2021 06:58:27 -0700 (PDT) Subject: Re: [PATCH] fs/fuse/virtio_fs: Fix a potential memory allocation failure To: zhouchuangao , Vivek Goyal , Stefan Hajnoczi , Miklos Szeredi , virtualization@lists.linux-foundation.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org References: <1616589523-32024-1-git-send-email-zhouchuangao@vivo.com> From: Connor Kuehl Message-ID: <7dbe66b5-344b-2008-ca8f-559a271a061f@redhat.com> Date: Wed, 24 Mar 2021 08:58:26 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.0 MIME-Version: 1.0 In-Reply-To: <1616589523-32024-1-git-send-email-zhouchuangao@vivo.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 3/24/21 7:38 AM, zhouchuangao wrote: > Allocate memory for struct fuse_conn may fail, we should not jump to > out_err to kfree(fc). Why not? If fc's allocation fails then it is NULL and calling kfree() on a NULL pointer is a noop[1]. Connor [1] https://www.kernel.org/doc/html/latest/core-api/mm-api.html?highlight=kfree#c.kfree