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https://issues.apache.org/jira/browse/FLINK-7402?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16134843#comment-16134843
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ASF GitHub Bot commented on FLINK-7402:
---------------------------------------
Github user NicoK commented on a diff in the pull request:
https://github.com/apache/flink/pull/4562#discussion_r134166175
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/netty/NettyMessage.java
---
@@ -220,6 +220,10 @@ void releaseBuffer() {
@Override
ByteBuf write(ByteBufAllocator allocator) throws IOException {
+ if (null == buffer) {
+ throw new NullPointerException();
--- End diff --
actually, better use `Preconditions#checkNotNull(T)` - an additional error
message there usually does not make too much sense as the failure is clear
> Ineffective null check in NettyMessage#write()
> ----------------------------------------------
>
> Key: FLINK-7402
> URL: https://issues.apache.org/jira/browse/FLINK-7402
> Project: Flink
> Issue Type: Bug
> Components: Network
> Reporter: Ted Yu
> Priority: Minor
>
> Here is the null check in finally block:
> {code}
> finally {
> if (buffer != null) {
> buffer.recycle();
> }
> {code}
> But buffer has been dereferenced in the try block without guard.
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