linux-kernel - [PATCH 3.16 021/305] cpupower: remove stringop-truncation waring

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Date:   Sun, 03 Feb 2019 14:45:08 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Anders Roxell" <anders.roxell@...aro.org>,
        "Shuah Khan (Samsung OSG)" <shuah@...nel.org>
Subject: [PATCH 3.16 021/305] cpupower: remove stringop-truncation waring

3.16.63-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Anders Roxell <anders.roxell@...aro.org>

commit 8a7e2d2ea080d10a189a1d611344b0330468ebc3 upstream.

The strncpy doesn't null terminate the string because the size is too
short by one byte.

parse.c: In function ‘prepare_default_config’:
parse.c:148:2: warning: ‘strncpy’ output truncated before terminating
    nul copying 8 bytes from a string of the same length
    [-Wstringop-truncation]
  strncpy(config->governor, "ondemand", 8);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The normal method of passing the length of the destination buffer works
correctly here.

Fixes: 7fe2f6399a84 ("cpupowerutils - cpufrequtils extended with quite some features")
Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
Signed-off-by: Shuah Khan (Samsung OSG) <shuah@...nel.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 tools/power/cpupower/bench/parse.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/tools/power/cpupower/bench/parse.c
+++ b/tools/power/cpupower/bench/parse.c
@@ -135,7 +135,7 @@ struct config *prepare_default_config()
 	config->cpu = 0;
 	config->prio = SCHED_HIGH;
 	config->verbose = 0;
-	strncpy(config->governor, "ondemand", 8);
+	strncpy(config->governor, "ondemand", sizeof(config->governor));
 
 	config->output = stdout;