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sc_need_room() function may be called with a negative value. In this case, the intent is to be notified if any space was made in the channel buffer. In the function, we get the min between the requested room and the maximum possible room in the buffer, considering it may be an HTX buffer. However this max value is unsigned and leads to an unsigned comparison, casting the negative value to an unsigned value. Of course, in this case, this always leads to the wrong result. This bug seems to have no effect but it is hard to be sure. To fix the issue, we take care to respect the requested room sign by casting the max value to a signed integer. This patch must be backported to 2.8.
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)