selftests/resctrl: Fix uninitialized .sa_flags

commit beb7f471847663559bd0fe60af1d70e05a1d7c6c upstream.

signal_handler_unregister() calls sigaction() with uninitializing
sa_flags in the struct sigaction.

Make sure sa_flags is always initialized in signal_handler_unregister()
by initializing the struct sigaction when declaring it. Also add the
initialization to signal_handler_register() even if there are no know
bugs in there because correctness is then obvious from the code itself.

Fixes: 73c55fa5ab55 ("selftests/resctrl: Commonize the signal handler register/unregister for all tests")
Suggested-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Cc: <stable@vger.kernel.org>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/tools/testing/selftests/resctrl/resctrl_val.c b/tools/testing/selftests/resctrl/resctrl_val.c
index f0f6c5f..ee07e09 100644 (file)
--- a/tools/testing/selftests/resctrl/resctrl_val.c
+++ b/tools/testing/selftests/resctrl/resctrl_val.c
@@ -482,7 +482,7 @@ void ctrlc_handler(int signum, siginfo_t *info, void *ptr)
  */
 int signal_handler_register(void)
 {
-       struct sigaction sigact;
+       struct sigaction sigact = {};
        int ret = 0;
 
        sigact.sa_sigaction = ctrlc_handler;
@@ -504,7 +504,7 @@ int signal_handler_register(void)
  */
 void signal_handler_unregister(void)
 {
-       struct sigaction sigact;
+       struct sigaction sigact = {};
 
        sigact.sa_handler = SIG_DFL;
        sigemptyset(&sigact.sa_mask);