From 4d09ebcaec99d760908834e3860d654819752d76 Mon Sep 17 00:00:00 2001
From: Juha Niskanen <juha.niskanen@haltian.com>
Date: Wed, 26 Apr 2017 10:32:20 -0600
Subject: [PATCH] examples: random: avoid stack overflows

---
 examples/random/Makefile      |  2 +-
 examples/random/random_main.c | 12 ++++++++----
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/examples/random/Makefile b/examples/random/Makefile
index 5e4231259..78ca31d91 100644
--- a/examples/random/Makefile
+++ b/examples/random/Makefile
@@ -39,7 +39,7 @@
 
 APPNAME = rand
 PRIORITY = SCHED_PRIORITY_DEFAULT
-STACKSIZE = 1024
+STACKSIZE = 2048
 
 ASRCS =
 CSRCS =
diff --git a/examples/random/random_main.c b/examples/random/random_main.c
index 6abcaaa97..f3d6cbffe 100644
--- a/examples/random/random_main.c
+++ b/examples/random/random_main.c
@@ -92,12 +92,16 @@ int rand_main(int argc, char *argv[])
 
   if (argc > 1)
     {
-      nsamples  = atoi(argv[1]);
+      nsamples = atoi(argv[1]);
     }
 
   /* Clip the number of samples to the configured buffer size */
 
-  if (nsamples > CONFIG_EXAMPLES_MAXSAMPLES)
+  if (nsamples < 0)
+    {
+      nsamples = 0;
+    }
+  else if (nsamples > CONFIG_EXAMPLES_MAXSAMPLES)
     {
       nsamples = CONFIG_EXAMPLES_MAXSAMPLES;
     }
@@ -124,14 +128,14 @@ int rand_main(int argc, char *argv[])
   if (nread < 0)
     {
       int errcode = errno;
-      fprintf(stderr, "ERROR: Read from /dev/randon failed: %d\n", errcode);
+      fprintf(stderr, "ERROR: Read from /dev/random failed: %d\n", errcode);
       (void)close(fd);
       exit(EXIT_FAILURE);
     }
 
   if (nread != nsamples * sizeof(uint32_t))
     {
-      fprintf(stderr, "ERROR: Read from /dev/randon only produced %d bytes\n",
+      fprintf(stderr, "ERROR: Read from /dev/random only produced %d bytes\n",
               (int)nread);
       (void)close(fd);
       exit(EXIT_FAILURE);