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After reading a datagram, it is enqueud for the thread attached to the DCID. This is done via quic_lstnr_dgram_dispatch() function. If this step fails, we remove the datagram from the buffer of quic_receiver_buf. This step is faulty because we use b_del() instead of b_sub(). If quic_receiver_buf was not empty, we will remove content from another datagram while leaving the content of the last read datagram. This probably produces valid datagram dropping and may even result in crash. As stated, this bug can only happen if qc_lstnr_dgram_dispatch() fails which happen on two occaions : * on quic_dgram allocation failure, which should be pretty rare * on datagram labelled as invalid for QUIC protocol. This may happen more frequently depending on the network conditions. Thus, this bug has been labelled as a medium one. This should be backported up to 2.6. |
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The HAProxy documentation has been split into a number of different files for ease of use. Please refer to the following files depending on what you're looking for : - INSTALL for instructions on how to build and install HAProxy - BRANCHES to understand the project's life cycle and what version to use - LICENSE for the project's license - CONTRIBUTING for the process to follow to submit contributions The more detailed documentation is located into the doc/ directory : - doc/intro.txt for a quick introduction on HAProxy - doc/configuration.txt for the configuration's reference manual - doc/lua.txt for the Lua's reference manual - doc/SPOE.txt for how to use the SPOE engine - doc/network-namespaces.txt for how to use network namespaces under Linux - doc/management.txt for the management guide - doc/regression-testing.txt for how to use the regression testing suite - doc/peers.txt for the peers protocol reference - doc/coding-style.txt for how to adopt HAProxy's coding style - doc/internals for developer-specific documentation (not all up to date)