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dsoumis pushed a commit to branch 10.1.x
in repository https://gitbox.apache.org/repos/asf/tomcat.git


The following commit(s) were added to refs/heads/10.1.x by this push:
     new 556122adef Refactor CORS validation order with explicit guard clauses
556122adef is described below

commit 556122adef739d45247972bd6e68d69f96a10037
Author: Dimitris Soumis <jimsou...@gmail.com>
AuthorDate: Fri Feb 14 12:24:28 2025 +0200

    Refactor CORS validation order with explicit guard clauses
    
    - Check for null originHeader first to prevent NPEs.
    - Validate empty or invalid originHeader before performing same-origin 
checks.
---
 java/org/apache/catalina/filters/CorsFilter.java | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/java/org/apache/catalina/filters/CorsFilter.java 
b/java/org/apache/catalina/filters/CorsFilter.java
index f96d26fda0..7363aa9f62 100644
--- a/java/org/apache/catalina/filters/CorsFilter.java
+++ b/java/org/apache/catalina/filters/CorsFilter.java
@@ -542,12 +542,15 @@ public class CorsFilter extends GenericFilter {
             throw new 
IllegalArgumentException(sm.getString("corsFilter.nullRequest"));
         }
         String originHeader = request.getHeader(REQUEST_HEADER_ORIGIN);
-        if (originHeader == null || RequestUtil.isSameOrigin(request, 
originHeader)) {
+        if (originHeader == null) {
             return CORSRequestType.NOT_CORS;
         }
-        if (originHeader.isEmpty() ||!RequestUtil.isValidOrigin(originHeader)) 
{
+        if (originHeader.isEmpty() || 
!RequestUtil.isValidOrigin(originHeader)) {
             return CORSRequestType.INVALID_CORS;
         }
+        if(RequestUtil.isSameOrigin(request, originHeader)) {
+            return CORSRequestType.NOT_CORS;
+        }
         String method = request.getMethod();
         if (method == null) {
             return CORSRequestType.INVALID_CORS;


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