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In b_is_null(), make sure we return 1 if the buffer is waiting for its allocation, as users assume there's memory allocated if b_is_null() returns 0. The indirect impact of not having this was that htxbuf() would not match b_is_null() for a buffer waiting for an allocation, and would thus return the value 1 for the htx pointer, causing various crashes under low memory condition. Note that this patch makes gcc versions 6 and above report two null-deref warnings in proto_htx.c since htx_is_empty() continues to check for a null pointer without knowing that this is protected by the test on b_is_null(). This is addressed by the following patches. This should be backported to 1.9.
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 - 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)