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kdc: unused pid element is (pid_t)-1 not zero

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When the termination of a child process is observed by reap_kid() it
clears the pids[] element by assigning it the invalid pid value
(pid_t)-1. However, start_kdc() assumes that the unused pid[[] element
value is 0.  As a result, each pid[] element's associated child process
can only be restarted once since start_kdc() will not be able to locate
an unused element.

This change alters start_kdc() to initialize all elements of pids[] to
(pid_t)-1 and use that as the marker for unused elements.  By doing so
start_kdc() can properly record child process pids and indefinitely
restart child processes as necessary.

Change-Id: Ia93c9284ab21289994eca7fc9cf1278be7c00683
This commit is contained in:
Jeffrey Altman
2017-07-22 10:39:41 -04:00
committed by Nico Williams
parent b787491942
commit 237cd892d9
1 changed files with 9 additions and 7 deletions
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8
kdc/connect.c
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@@ -1122,9 +1122,11 @@ start_kdc(krb5_context context,
if (max_kdcs < 1)
max_kdcs = 1;
pids = calloc(max_kdcs, sizeof(*pids));
pids = malloc(max_kdcs * sizeof(*pids));
if (!pids)
krb5_err(context, 1, errno, "malloc");
for (i = 0; i < max_kdcs; i++)
pids[i] = (pid_t)-1;
/*
* We open a socketpair of which we hand one end to each of our kids.
@@ -1196,8 +1198,8 @@ start_kdc(krb5_context context,
sleep(10);
break;
default:
for (i=0; i < max_kdcs; i++) {
if (pids[i] == 0) {
for (i = 0; i < max_kdcs; i++) {
if (pids[i] == (pid_t)-1) {
pids[i] = pid;
break;
}