linux-kernel - [PATCH v4 04/19] selftests/resctrl: Close perf value read fd on errors

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Date:   Thu, 13 Jul 2023 16:19:17 +0300
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     linux-kselftest@...r.kernel.org,
        Reinette Chatre <reinette.chatre@...el.com>,
        Shuah Khan <shuah@...nel.org>,
        Shaopeng Tan <tan.shaopeng@...fujitsu.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>,
        Babu Moger <babu.moger@....com>, linux-kernel@...r.kernel.org
Cc:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH v4 04/19] selftests/resctrl: Close perf value read fd on errors

Perf event fd (fd_lm) is not closed on some error paths.

Always close fd_lm in get_llc_perf() and add close into an error
handling block in cat_val().

Fixes: 790bf585b0ee ("selftests/resctrl: Add Cache Allocation Technology (CAT) selftest")
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
 tools/testing/selftests/resctrl/cache.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/resctrl/cache.c b/tools/testing/selftests/resctrl/cache.c
index 8a4fe8693be6..ced47b445d1e 100644
--- a/tools/testing/selftests/resctrl/cache.c
+++ b/tools/testing/selftests/resctrl/cache.c
@@ -87,21 +87,20 @@ static int reset_enable_llc_perf(pid_t pid, int cpu_no)
 static int get_llc_perf(unsigned long *llc_perf_miss)
 {
 	__u64 total_misses;
+	int ret;
 
 	/* Stop counters after one span to get miss rate */
 
 	ioctl(fd_lm, PERF_EVENT_IOC_DISABLE, 0);
 
-	if (read(fd_lm, &rf_cqm, sizeof(struct read_format)) == -1) {
+	ret = read(fd_lm, &rf_cqm, sizeof(struct read_format));
+	close(fd_lm);
+	if (ret == -1) {
 		perror("Could not get llc misses through perf");
-
 		return -1;
 	}
 
 	total_misses = rf_cqm.values[0].value;
-
-	close(fd_lm);
-
 	*llc_perf_miss = total_misses;
 
 	return 0;
@@ -253,6 +252,7 @@ int cat_val(struct resctrl_val_param *param)
 					 memflush, operation, resctrl_val)) {
 				fprintf(stderr, "Error-running fill buffer\n");
 				ret = -1;
+				close(fd_lm);
 				break;
 			}
 
-- 
2.30.2