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HAProxy - Load balancer
bed842390f
In parse_new_proxy(), when proxy_defproxy_cpy() fails, the error path used
ha_free(&curproxy) to release the partially constructed proxy. However, the
proxy was allocated via alloc_new_proxy() which performs significant setup:
- setup_new_proxy() inserts it into the proxy_by_name tree (proxy_store_name)
- It appends to the global proxies list (LIST_APPEND)
- proxy_take() increments its refcount
Additionally, proxy_defproxy_cpy() may have allocated further resources
(strdup'd strings, compression structures, email alert fields, etc).
Using ha_free() only freed the proxy struct itself, leaving:
- The proxy still registered in the name tree (dangling pointer)
- The proxy still linked in the global proxies list
- All strdup'd strings and other allocations leaked
This is visible with ASAN when causing random allocation errors:
[NOTICE] (27033) : haproxy version is 3.4-dev12-b15468-11
[NOTICE] (27033) : path to executable is ./haproxy
[ALERT] (27033) : config : parsing [/dev/stdin:5015] : proxy 'bk3': failed to duplicate tcpcheck preset-vars
[ALERT] (27033) : config : Error(s) found in configuration file : /dev/stdin
=================================================================
==27033==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 4 byte(s) in 1 object(s) allocated from:
#0 0x7f113e518e20 in strdup (/usr/lib64/libasan.so.8+0x118e20)
#1 0x000000955410 in setup_new_proxy src/proxy.c:3178
#2 0x000000955816 in alloc_new_proxy src/proxy.c:3221
#3 0x000000956c33 in parse_new_proxy src/proxy.c:3554
#4 0x000000a24d03 in cfg_parse_listen src/cfgparse-listen.c:495
#5 0x00000089d33e in parse_cfg src/cfgparse.c:2202
#6 0x0000009e0bb9 in read_cfg src/haproxy.c:1142
#7 0x000000447e8c in main src/haproxy.c:3474
#8 0x7f113d82ad13 in __libc_start_call_main (/lib64/libc.so.6+0x2ad13)
#9 0x7fff65b4e320 ([stack]+0x20320)
SUMMARY: AddressSanitizer: 4 byte(s) leaked in 1 allocation(s).
The fix replaces ha_free(&curproxy) with proxy_drop(curproxy), which
properly calls deinit_proxy() to release all internal resources, removes
the proxy from trees and lists, decrements the refcount, and frees the
struct.
No backport is needed since proxy_drop() is only in 3.4.
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HAProxy
HAProxy is a free, very fast and reliable reverse-proxy offering high availability, load balancing, and proxying for TCP and HTTP-based applications.
Installation
The INSTALL file describes how to build HAProxy. A list of packages is also available on the wiki.
Getting help
The discourse and the mailing-list are available for questions or configuration assistance. You can also use the slack or IRC channel. Please don't use the issue tracker for these.
The issue tracker is only for bug reports or feature requests.
Documentation
The HAProxy documentation has been split into a number of different files for ease of use. It is available in text format as well as HTML. The wiki is also meant to replace the old architecture guide.
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)
License
HAProxy is licensed under GPL 2 or any later version, the headers under LGPL 2.1. See the LICENSE file for a more detailed explanation.