tree c0f5d64062b3d59d285e833fd76687c9760a1452
parent a64593c80ddd4c73af09491140786537de3b4a16
author Tim Duesterhus <tim@bastelstu.be> 1584475704 +0100
committer Willy Tarreau <w@1wt.eu> 1584505048 +0100
encoding latin1

BUG/MINOR: pattern: Do not pass len = 0 to calloc()

The behavior of calloc() when being passed `0` as `nelem` is implementation
defined. It may return a NULL pointer.

Avoid this issue by checking before allocating. While doing so adjust the local
integer variables that are used to refer to memory offsets to `size_t`.

This issue was introced in commit f91ac19299fe216a793ba6550dca06b688b31549. This
patch should be backported together with that commit.