From 1c4f98e76614da8044680c052f06a39957d63133 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Sun, 5 Apr 2026 14:46:40 +0200
Subject: [PATCH] share: do bitshifts after the type is checked to be valid

Fixes #21224
Reported-by: bird on github
---
 lib/curl_share.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/curl_share.c b/lib/curl_share.c
index 94d53e8911..386a2b547d 100644
--- a/lib/curl_share.c
+++ b/lib/curl_share.c
@@ -281,7 +281,6 @@ CURLSHcode curl_share_setopt(CURLSH *sh, CURLSHoption option, ...)
   case CURLSHOPT_UNSHARE:
     /* this is a type this share will no longer share */
     type = va_arg(param, int);
-    share->specifier &= ~(unsigned int)(1 << type);
     switch(type) {
     case CURL_LOCK_DATA_DNS:
       break;
@@ -325,6 +324,8 @@ CURLSHcode curl_share_setopt(CURLSH *sh, CURLSHoption option, ...)
       res = CURLSHE_BAD_OPTION;
       break;
     }
+    if(!res)
+      share->specifier &= ~(unsigned int)(1 << type);
     break;
 
   case CURLSHOPT_LOCKFUNC: