When a backend is created at runtime, the new proxy instance is inserted
at the end of proxies_list. This operation is buggy if this list is
empty : the code causes a null dereference which will lead to a crash.
This causes the following compilation error :
CC src/proxy.o
src/proxy.c: In function 'cli_parse_add_backend':
src/proxy.c:4933:36: warning: null pointer dereference [-Wnull-dereference]
4933 | proxies_list->next = px;
| ~~~~~~~~~~~~~~~~~~~^~~~
This patch fixes this issue. Note that in reality it cannot occur at
this moment as proxies_list cannot be empty (haproxy requires at least
one frontend to start, and the list also always contains internal
proxies).
No need to backport.
a1db464c3e