From b8f7882028ec6a5f147aa4e0cb27f0b9ffdc6035 Mon Sep 17 00:00:00 2001
From: Johannes Berg <johannes.berg@intel.com>
Date: Fri, 23 Aug 2019 12:44:27 +0200
Subject: [PATCH] um: Avoid using uninitialized regs

In timer_real_alarm_handler(), regs is only initialized if
the context argument is non-NULL, also initialize in the
other case.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-by: Anton Ivanov <anton.ivanov@cambridgegreys.co.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
---
 arch/um/os-Linux/signal.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c
index 35d1b2bc00cb..4cd88b5b9006 100644
--- a/arch/um/os-Linux/signal.c
+++ b/arch/um/os-Linux/signal.c
@@ -10,6 +10,7 @@
 #include <stdarg.h>
 #include <errno.h>
 #include <signal.h>
+#include <string.h>
 #include <strings.h>
 #include <as-layout.h>
 #include <kern_util.h>
@@ -88,6 +89,8 @@ static void timer_real_alarm_handler(mcontext_t *mc)
 
 	if (mc != NULL)
 		get_regs_from_mc(&regs, mc);
+	else
+		memset(&regs, 0, sizeof(regs));
 	timer_handler(SIGALRM, NULL, &regs);
 }