From f7d4d5a0ecd5e64db72057e15048509ddeff4994 Mon Sep 17 00:00:00 2001
From: Simon Duquennoy <simon.duquennoy@gmail.com>
Date: Mon, 10 Jul 2017 16:32:41 +0200
Subject: [PATCH] Fix Shell log command argument parsing

---
 apps/shell/shell-commands.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/apps/shell/shell-commands.c b/apps/shell/shell-commands.c
index bfbd94e32..33ce46163 100644
--- a/apps/shell/shell-commands.c
+++ b/apps/shell/shell-commands.c
@@ -192,7 +192,11 @@ PT_THREAD(cmd_log(struct pt *pt, shell_output_func output, char *args))
 
   /* Get and parse argument */
   SHELL_ARGS_NEXT(args, next_args);
-  level = (int)strtol(args, &ptr, 10);
+  if(args == NULL) {
+    level = -1;
+  } else {
+    level = (int)strtol(args, &ptr, 10);
+  }
   if((level == 0 && args == ptr)
     || level < LOG_LEVEL_NONE || level > LOG_LEVEL_DBG) {
     SHELL_OUTPUT(output, "Invalid argument: %s\n", args);