Fix NPE when upgrade message fails to aggregate (#14816)#14831
Merged
normanmaurer merged 1 commit intonetty:4.2from Feb 18, 2025
Merged
Fix NPE when upgrade message fails to aggregate (#14816)#14831normanmaurer merged 1 commit intonetty:4.2from
normanmaurer merged 1 commit intonetty:4.2from
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Motivation: When an HTTP message fails to aggregate, for example due to an invalid 'Expect' header, MessageAggregator does not produce a FullHttpRequest. HttpServerUpgradeHandler would then continue with the next request, wrongly believing it to be an upgrade request, even though only the previous one was. This produces an NPE: ``` Caused by: java.lang.NullPointerException: Cannot invoke "java.lang.CharSequence.length()" because "header" is null at io.netty.handler.codec.http.HttpServerUpgradeHandler.splitHeader(HttpServerUpgradeHandler.java:429) at io.netty.handler.codec.http.HttpServerUpgradeHandler.upgrade(HttpServerUpgradeHandler.java:328) at io.netty.handler.codec.http.HttpServerUpgradeHandler.decode(HttpServerUpgradeHandler.java:290) at io.netty.handler.codec.http.HttpServerUpgradeHandler.decode(HttpServerUpgradeHandler.java:40) at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:91) ... 35 common frames omitted ``` Modification: When the upgrade handler sees a LastHttpContent, cancel the current upgrade and cancel aggregation. Result: No NPE for this input. Found by fuzzing.
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Motivation:
When an HTTP message fails to aggregate, for example due to an invalid 'Expect' header, MessageAggregator does not produce a FullHttpRequest. HttpServerUpgradeHandler would then continue with the next request, wrongly believing it to be an upgrade request, even though only the previous one was. This produces an NPE:
Modification:
When the upgrade handler sees a LastHttpContent, cancel the current upgrade and cancel aggregation.
Result:
No NPE for this input.
Found by fuzzing.