Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Thu, 6 Apr 2023 18:09:29 -0300
From:   Arnaldo Carvalho de Melo <acme@kernel.org>
To:     Ian Rogers <irogers@google.com>, Jiri Olsa <jolsa@kernel.org>
Cc:     Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Namhyung Kim <namhyung@kernel.org>,
        Adrian Hunter <adrian.hunter@intel.com>,
        James Clark <james.clark@arm.com>,
        Suzuki Poulouse <suzuki.poulose@arm.com>,
        Sean Christopherson <seanjc@google.com>,
        Ravi Bangoria <ravi.bangoria@amd.com>,
        Rob Herring <robh@kernel.org>, Leo Yan <leo.yan@linaro.org>,
        German Gomez <german.gomez@arm.com>,
        Jing Zhang <renyu.zj@linux.alibaba.com>,
        Gaosheng Cui <cuigaosheng1@huawei.com>,
        linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 2/2] perf pmu: Fix a few potential fd leaks
Message-ID: <ZC81CTH/VayirB5z@kernel.org>
References: <20230406065224.2553640-1-irogers@google.com>
 <20230406065224.2553640-2-irogers@google.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20230406065224.2553640-2-irogers@google.com>
Precedence: bulk

Em Wed, Apr 05, 2023 at 11:52:24PM -0700, Ian Rogers escreveu:
> Ensure fd is closed on error paths.

Was this reported by Jiri?

- Arnaldo
 
> Signed-off-by: Ian Rogers <irogers@google.com>
> ---
>  tools/perf/util/pmu.c | 12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
> index 96ef317bac41..9eedbfc9e863 100644
> --- a/tools/perf/util/pmu.c
> +++ b/tools/perf/util/pmu.c
> @@ -494,9 +494,13 @@ static int pmu_aliases_parse(int dirfd, struct list_head *head)
>  			continue;
>  
>  		fd = openat(dirfd, name, O_RDONLY);
> +		if (fd == -1) {
> +			pr_debug("Cannot open %s\n", name);
> +			continue;
> +		}
>  		file = fdopen(fd, "r");
>  		if (!file) {
> -			pr_debug("Cannot open %s\n", name);
> +			close(fd);
>  			continue;
>  		}
>  
> @@ -1882,9 +1886,13 @@ int perf_pmu__caps_parse(struct perf_pmu *pmu)
>  			continue;
>  
>  		fd = openat(caps_fd, name, O_RDONLY);
> +		if (fd == -1)
> +			continue;
>  		file = fdopen(fd, "r");
> -		if (!file)
> +		if (!file) {
> +			close(fd);
>  			continue;
> +		}
>  
>  		if (!fgets(value, sizeof(value), file) ||
>  		    (perf_pmu__new_caps(&pmu->caps, name, value) < 0)) {
> -- 
> 2.40.0.348.gf938b09366-goog
> 

-- 

- Arnaldo