[tomcat] 03/03: Avoid NPE (observed when running tests)

[markt]

This is an automated email from the ASF dual-hosted git repository.

markt pushed a commit to branch 8.5.x
in repository https://gitbox.apache.org/repos/asf/tomcat.git

commit b6ace6f2274298ceec3d1de762b95d109e4aa695
Author: Mark Thomas <ma...@apache.org>
AuthorDate: Tue Dec 7 10:01:10 2021 +0000

    Avoid NPE (observed when running tests)
---
 java/org/apache/tomcat/util/net/NioBlockingSelector.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/java/org/apache/tomcat/util/net/NioBlockingSelector.java 
b/java/org/apache/tomcat/util/net/NioBlockingSelector.java
index 3199d04..3a629d3 100644
--- a/java/org/apache/tomcat/util/net/NioBlockingSelector.java
+++ b/java/org/apache/tomcat/util/net/NioBlockingSelector.java
@@ -91,6 +91,9 @@ public class NioBlockingSelector {
             reference = new KeyReference();
         }
         NioSocketWrapper att = (NioSocketWrapper) key.attachment();
+        if (att == null) {
+            throw new IOException();
+        }
         if (att.previousIOException != null) {
             /*
              * Socket has previously seen an IOException on write.

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