Correct HTTP/2 padding length check#15793
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Motivation: When the padding of an HTTP/2 DATA frame exceeds the bounds of the frame, an IndexOutOfBoundsException would be thrown instead of the expected Http2Exception: ``` Exception in thread "main" java.lang.IndexOutOfBoundsException: readerIndex: 1, writerIndex: 0 (expected: 0 <= readerIndex <= writerIndex <= capacity(4)) at io.netty.buffer.AbstractByteBuf.checkIndexBounds(AbstractByteBuf.java:112) at io.netty.buffer.AbstractByteBuf.writerIndex(AbstractByteBuf.java:135) at io.netty.buffer.WrappedByteBuf.writerIndex(WrappedByteBuf.java:132) at io.netty.handler.codec.http2.DefaultHttp2FrameReader.readDataFrame(DefaultHttp2FrameReader.java:408) at io.netty.handler.codec.http2.DefaultHttp2FrameReader.processPayloadState(DefaultHttp2FrameReader.java:244) at io.netty.handler.codec.http2.DefaultHttp2FrameReader.readFrame(DefaultHttp2FrameReader.java:164) ``` Modification: Instead of verifying the padding size against the full payloadLength, which includes the pad length, move the check to lengthWithoutTrailingPadding where the exact number of remaining bytes is known. Result: Proper protocol error.
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@yawkat thanks a lot! |
normanmaurer
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Oct 27, 2025
Motivation: When the padding of an HTTP/2 DATA frame exceeds the bounds of the frame, an IndexOutOfBoundsException would be thrown instead of the expected Http2Exception: ``` Exception in thread "main" java.lang.IndexOutOfBoundsException: readerIndex: 1, writerIndex: 0 (expected: 0 <= readerIndex <= writerIndex <= capacity(4)) at io.netty.buffer.AbstractByteBuf.checkIndexBounds(AbstractByteBuf.java:112) at io.netty.buffer.AbstractByteBuf.writerIndex(AbstractByteBuf.java:135) at io.netty.buffer.WrappedByteBuf.writerIndex(WrappedByteBuf.java:132) at io.netty.handler.codec.http2.DefaultHttp2FrameReader.readDataFrame(DefaultHttp2FrameReader.java:408) at io.netty.handler.codec.http2.DefaultHttp2FrameReader.processPayloadState(DefaultHttp2FrameReader.java:244) at io.netty.handler.codec.http2.DefaultHttp2FrameReader.readFrame(DefaultHttp2FrameReader.java:164) ``` Modification: Instead of verifying the padding size against the full payloadLength, which includes the pad length, move the check to lengthWithoutTrailingPadding where the exact number of remaining bytes is known. Result: Proper protocol error.
normanmaurer
pushed a commit
that referenced
this pull request
Oct 27, 2025
Motivation: When the padding of an HTTP/2 DATA frame exceeds the bounds of the frame, an IndexOutOfBoundsException would be thrown instead of the expected Http2Exception: ``` Exception in thread "main" java.lang.IndexOutOfBoundsException: readerIndex: 1, writerIndex: 0 (expected: 0 <= readerIndex <= writerIndex <= capacity(4)) at io.netty.buffer.AbstractByteBuf.checkIndexBounds(AbstractByteBuf.java:112) at io.netty.buffer.AbstractByteBuf.writerIndex(AbstractByteBuf.java:135) at io.netty.buffer.WrappedByteBuf.writerIndex(WrappedByteBuf.java:132) at io.netty.handler.codec.http2.DefaultHttp2FrameReader.readDataFrame(DefaultHttp2FrameReader.java:408) at io.netty.handler.codec.http2.DefaultHttp2FrameReader.processPayloadState(DefaultHttp2FrameReader.java:244) at io.netty.handler.codec.http2.DefaultHttp2FrameReader.readFrame(DefaultHttp2FrameReader.java:164) ``` Modification: Instead of verifying the padding size against the full payloadLength, which includes the pad length, move the check to lengthWithoutTrailingPadding where the exact number of remaining bytes is known. Result: Proper protocol error.
normanmaurer
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that referenced
this pull request
Oct 28, 2025
Motivation: When the padding of an HTTP/2 DATA frame exceeds the bounds of the frame, an IndexOutOfBoundsException would be thrown instead of the expected Http2Exception: ``` Exception in thread "main" java.lang.IndexOutOfBoundsException: readerIndex: 1, writerIndex: 0 (expected: 0 <= readerIndex <= writerIndex <= capacity(4)) at io.netty.buffer.AbstractByteBuf.checkIndexBounds(AbstractByteBuf.java:112) at io.netty.buffer.AbstractByteBuf.writerIndex(AbstractByteBuf.java:135) at io.netty.buffer.WrappedByteBuf.writerIndex(WrappedByteBuf.java:132) at io.netty.handler.codec.http2.DefaultHttp2FrameReader.readDataFrame(DefaultHttp2FrameReader.java:408) at io.netty.handler.codec.http2.DefaultHttp2FrameReader.processPayloadState(DefaultHttp2FrameReader.java:244) at io.netty.handler.codec.http2.DefaultHttp2FrameReader.readFrame(DefaultHttp2FrameReader.java:164) ``` Modification: Instead of verifying the padding size against the full payloadLength, which includes the pad length, move the check to lengthWithoutTrailingPadding where the exact number of remaining bytes is known. Result: Proper protocol error. Co-authored-by: Jonas Konrad <jonas.konrad@oracle.com>
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Motivation:
When the padding of an HTTP/2 DATA frame exceeds the bounds of the frame, an IndexOutOfBoundsException would be thrown instead of the expected Http2Exception:
Modification:
Instead of verifying the padding size against the full payloadLength, which includes the pad length, move the check to lengthWithoutTrailingPadding where the exact number of remaining bytes is known.
Result:
Proper protocol error.