From c83985c5ce7acca8b342dccd7aa77b4760f83aca Mon Sep 17 00:00:00 2001
From: Fotis Panagiotopoulos <f.panag@amco.gr>
Date: Mon, 29 Aug 2022 15:53:03 +0300
Subject: [PATCH] Fixes in strtod parser.

---
 libs/libc/stdlib/lib_strtod.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/libs/libc/stdlib/lib_strtod.c b/libs/libc/stdlib/lib_strtod.c
index 57f60787bb2..358eb5aec23 100644
--- a/libs/libc/stdlib/lib_strtod.c
+++ b/libs/libc/stdlib/lib_strtod.c
@@ -160,6 +160,7 @@ double strtod(FAR const char *str, FAR char **endptr)
     {
       set_errno(ERANGE);
       number = 0.0;
+      p = (FAR char *)str;
       goto errout;
     }
 
@@ -195,6 +196,14 @@ double strtod(FAR const char *str, FAR char **endptr)
 
       /* Process string of digits */
 
+      if (!isdigit(*p))
+        {
+          set_errno(ERANGE);
+          number = 0.0;
+          p = (FAR char *)str;
+          goto errout;
+        }
+
       n = 0;
       while (isdigit(*p))
         {