rmaucher commented on a change in pull request #246: OpenSSLEngine improvements
to guard against multiple shutdown() calls triggered by construction exception
and finalize() later
URL: https://github.com/apache/tomcat/pull/246#discussion_r381181675
##########
File path: java/org/apache/tomcat/util/net/openssl/OpenSSLEngine.java
##########
@@ -219,10 +218,14 @@ public String getNegotiatedProtocol() {
* Destroys this engine.
*/
public synchronized void shutdown() {
- if (!destroyed) {
- destroyed = true;
- SSL.freeBIO(networkBIO);
- SSL.freeSSL(ssl);
+ // Guard against multiple shutdown() calls triggered by construction
exception and finalize() later
+ if (destroyed.compareAndSet(false, true)) {
+ if (networkBIO != 0) {
+ SSL.freeBIO(networkBIO);
+ }
+ if (ssl != 0) {
+ SSL.freeSSL(ssl);
+ }
Review comment:
That's the best part of the change since it could take care of mysterious
errors.
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