From a50f687344f5bc54de2ca12801d46fb96f5d4b62 Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <tridge@samba.org>
Date: Thu, 6 Nov 2014 19:28:38 +1100
Subject: lib_sscanf: fixed a hang in scanf() on end of string

if we reach end of buffer when we are not on a format specifier then
the code would loop forever.
---
 nuttx/libc/stdio/lib_sscanf.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/nuttx/libc/stdio/lib_sscanf.c b/nuttx/libc/stdio/lib_sscanf.c
index 5c99ee47b..c1ad17323 100644
--- a/nuttx/libc/stdio/lib_sscanf.c
+++ b/nuttx/libc/stdio/lib_sscanf.c
@@ -699,6 +699,10 @@ int vsscanf(FAR char *buf, FAR const char *fmt, va_list ap)
               buf++;
             }
         }
+      else {
+          /* it is not a format specifier, and buf is empty. Stop matching */
+          break;
+      }
     }
 
     /* Clean up - read whitespaces */
-- 
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