tree 418b080913a21fd150f9715712982fa57cb49118
parent 4944c8cdb4fc2541d08a6a8bb527d9c9d952b93c
author Tim Duesterhus <tim@bastelstu.be> 1584475704 +0100
committer Willy Tarreau <w@1wt.eu> 1585670949 +0200
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.

(cherry picked from commit b584b4475be09a20dea07f35c605487a1b73425e)
Signed-off-by: Willy Tarreau <w@1wt.eu>
(cherry picked from commit 87fc6517dcbc7e967c879cbd1e3af2b64df02123)
Signed-off-by: Willy Tarreau <w@1wt.eu>