From 1667d5599dec62aa6836560f01e5c90bad52c6bb Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Sat, 8 Jun 2019 23:21:45 +0200
Subject: bindlocal: detect and avoid IP version mismatches in bind()

Reported-by: Alex Grebenschikov
Fixes #3993
Closes #4002
---
 lib/connect.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'lib/connect.c')

diff --git a/lib/connect.c b/lib/connect.c
index 002535b42..4a1f2c640 100644
--- a/lib/connect.c
+++ b/lib/connect.c
@@ -368,6 +368,11 @@ static CURLcode bindlocal(struct connectdata *conn,
         infof(data, "Name '%s' family %i resolved to '%s' family %i\n",
               dev, af, myhost, h->addr->ai_family);
         Curl_resolv_unlock(data, h);
+        if(af != h->addr->ai_family) {
+          /* bad IP version combo, signal the caller to try another address
+             family if available */
+          return CURLE_UNSUPPORTED_PROTOCOL;
+        }
         done = 1;
       }
       else {
-- 
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