From 81a25ba7a420df67013b320b71f3548a32e50360 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Mon, 13 Jan 2025 12:05:02 +0100
Subject: [PATCH] altsvc: return error on dot-only name

Because it is a trailing dot that otherwise leads to a zero length name.

Coverity CID 1638755.

Closes #15986
---
 lib/altsvc.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/lib/altsvc.c b/lib/altsvc.c
index 62f2c545fe..a77b1cf279 100644
--- a/lib/altsvc.c
+++ b/lib/altsvc.c
@@ -108,19 +108,20 @@ static struct altsvc *altsvc_createid(const char *srchost,
     return NULL;
   DEBUGASSERT(hlen);
   DEBUGASSERT(dlen);
-  if(!hlen || !dlen) {
+  if(!hlen || !dlen)
     /* bad input */
-    free(as);
-    return NULL;
-  }
+    goto error;
   if((hlen > 2) && srchost[0] == '[') {
     /* IPv6 address, strip off brackets */
     srchost++;
     hlen -= 2;
   }
-  else if(srchost[hlen - 1] == '.')
+  else if(srchost[hlen - 1] == '.') {
     /* strip off trailing dot */
     hlen--;
+    if(!hlen)
+      goto error;
+  }
   if((dlen > 2) && dsthost[0] == '[') {
     /* IPv6 address, strip off brackets */
     dsthost++;
-- 
2.47.3