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Wed, 10 Jul 2024 08:30:05 -0700 (PDT) Received: from [192.168.1.128] ([38.175.170.29]) by smtp.gmail.com with ESMTPSA id 8926c6da1cb9f-4c0b1c13848sm1184863173.133.2024.07.10.08.30.05 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 10 Jul 2024 08:30:05 -0700 (PDT) Message-ID: <273183c9-101c-422b-9fcd-a9921c127cb1@linuxfoundation.org> Date: Wed, 10 Jul 2024 09:30:04 -0600 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH bpf-next v2] selftests/bpf:fix a resource leak To: Zhu Jun , jolsa@kernel.org, shuah@kernel.org, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev, eddyz87@gmail.com, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, mykolal@fb.com, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Shuah Khan References: <20240710015913.2554-1-zhujun2@cmss.chinamobile.com> Content-Language: en-US From: Shuah Khan In-Reply-To: <20240710015913.2554-1-zhujun2@cmss.chinamobile.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 7/9/24 19:59, Zhu Jun wrote: > The requested resources should be closed before return > in main(), otherwise resource leak will occur > > Signed-off-by: Zhu Jun How did you find this problem? Please give more details on the tool used including the output from the tool. > --- > Changes in v2: > - check for cg_fd >= 0 and have just one out label > > tools/testing/selftests/bpf/test_sockmap.c | 11 +++++++---- > 1 file changed, 7 insertions(+), 4 deletions(-) > > diff --git a/tools/testing/selftests/bpf/test_sockmap.c b/tools/testing/selftests/bpf/test_sockmap.c > index a34e95040994..285a9a714666 100644 > --- a/tools/testing/selftests/bpf/test_sockmap.c > +++ b/tools/testing/selftests/bpf/test_sockmap.c > @@ -2075,8 +2075,10 @@ int main(int argc, char **argv) > > if (!cg_fd) { > cg_fd = cgroup_setup_and_join(CG_PATH); > - if (cg_fd < 0) > - return cg_fd; > + if (cg_fd < 0) { > + err = cg_fd; > + goto out; > + } I don't this this improves the code - it makes it more complex. If you want to improve this - add the same error message that gets printed out for case 'c': in argument parsing. fprintf(stderr, "ERROR: (%i) open cg path failed: %s\n", cg_fd, optarg); > cg_created = 1; > } > > @@ -2092,7 +2094,7 @@ int main(int argc, char **argv) > if (err) { > fprintf(stderr, "populate program: (%s) %s\n", > bpf_file, strerror(errno)); > - return 1; > + goto out; This looks good to me. > } > running = 1; > > @@ -2109,7 +2111,8 @@ int main(int argc, char **argv) > free(options.whitelist); > if (options.blacklist) > free(options.blacklist); > - close(cg_fd); > + if (cg_fd >= 0) Why is this check necessary? > + close(cg_fd); > if (cg_created) > cleanup_cgroup_environment(); > return err; thanks, -- Shuah