From 06755a871314c7443a89c09650cdb3982466e1a8 Mon Sep 17 00:00:00 2001
From: Seth Forshee <seth.forshee@canonical.com>
Date: Thu, 28 Sep 2017 09:34:26 -0400
Subject: [PATCH] selftests/powerpc: Use snprintf to construct DSCR sysfs
interface paths
References: bsc#1124579
Patch-mainline: v4.15-rc1
Git-commit: 06755a871314c7443a89c09650cdb3982466e1a8
Currently sprintf is used, and while paths should never exceed
the size of the buffer it is theoretically possible since
dirent.d_name is 256 bytes. As a result this trips
-Wformat-overflow, and since the test is built with -Wall -Werror
the causes the build to fail. Switch to using snprintf and skip
any paths which are too long for the filename buffer.
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Michal Suchanek <msuchanek@suse.de>
---
tools/testing/selftests/powerpc/dscr/dscr_sysfs_test.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/powerpc/dscr/dscr_sysfs_test.c b/tools/testing/selftests/powerpc/dscr/dscr_sysfs_test.c
index 17fb1b43c320..1899bd85121f 100644
--- a/tools/testing/selftests/powerpc/dscr/dscr_sysfs_test.c
+++ b/tools/testing/selftests/powerpc/dscr/dscr_sysfs_test.c
@@ -53,6 +53,8 @@ static int check_all_cpu_dscr_defaults(unsigned long val)
}
while ((dp = readdir(sysfs))) {
+ int len;
+
if (!(dp->d_type & DT_DIR))
continue;
if (!strcmp(dp->d_name, "cpuidle"))
@@ -60,7 +62,9 @@ static int check_all_cpu_dscr_defaults(unsigned long val)
if (!strstr(dp->d_name, "cpu"))
continue;
- sprintf(file, "%s%s/dscr", CPU_PATH, dp->d_name);
+ len = snprintf(file, LEN_MAX, "%s%s/dscr", CPU_PATH, dp->d_name);
+ if (len >= LEN_MAX)
+ continue;
if (access(file, F_OK))
continue;
--
2.19.2