From 844896d06416c9fdcacad5159f2a1a1d0293b9e5 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Fri, 9 Jun 2017 01:00:23 +0200
Subject: setopt: check CURLOPT_ADDRESS_SCOPE option range

... and return error instead of triggering an assert() when being way
out of range.
---
 lib/url.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/url.c b/lib/url.c
index b33579c70..84822d9bc 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -2616,7 +2616,10 @@ CURLcode Curl_setopt(struct Curl_easy *data, CURLoption option,
      * know that an unsigned int will always hold the value so we blindly
      * typecast to this type
      */
-    data->set.scope_id = curlx_sltoui(va_arg(param, long));
+    arg = va_arg(param, long);
+    if((arg < 0) || (arg > 0xf))
+      return CURLE_BAD_FUNCTION_ARGUMENT;
+    data->set.scope_id = curlx_sltoui(arg);
     break;
 
   case CURLOPT_PROTOCOLS:
-- 
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