linux-kernel - [PATCH] tools/power turbostat: Fix file pointer leak

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Date:   Tue, 26 Apr 2022 14:16:07 +0100
From:   Colin Ian King <colin.i.king@...il.com>
To:     Len Brown <lenb@...nel.org>, Chen Yu <yu.c.chen@...el.com>,
        linux-pm@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] tools/power turbostat: Fix file pointer leak

Currently if a fscanf fails then an early return leaks an open
file pointer. Fix this by fclosing the file before the return.
Detected using static analysis with cppcheck:

tools/power/x86/turbostat/turbostat.c:2039:3: error: Resource leak: fp [resourceLeak]

Fixes: eae97e053fe3 ("tools/power turbostat: Support thermal throttle count print")
Signed-off-by: Colin Ian King <colin.i.king@...il.com>
---
 tools/power/x86/turbostat/turbostat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index e6779f599a8e..db431b31c4df 100644
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -2035,9 +2035,9 @@ int get_core_throt_cnt(int cpu, unsigned long long *cnt)
 	if (!fp)
 		return -1;
 	ret = fscanf(fp, "%lld", &tmp);
+	fclose(fp);
 	if (ret != 1)
 		return -1;
-	fclose(fp);
 	*cnt = tmp;
 
 	return 0;
-- 
2.35.1