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selftests/powerpc: Use snprintf to construct DSCR sysfs interface paths 

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>
This commit is contained in:
Seth Forshee 2017-09-28 09:34:26 -04:00 committed by Michael Ellerman
parent 186b8f1587
commit 06755a8713
1 changed files with 5 additions and 1 deletions
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6
tools/testing/selftests/powerpc/dscr/dscr_sysfs_test.c
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@ -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;