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conf: Actually zero-terminate DNS and search list arrays

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This worked pretty much by chance until now.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio 2021-09-26 23:22:31 +02:00
parent 2dbed699e7
commit dfc4513190
1 changed files with 11 additions and 6 deletions
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17
conf.c
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@ -546,13 +546,17 @@ static void get_dns(struct ctx *c)
if (end)
*end = 0;
if (dns4 - &c->dns4[0] < ARRAY_SIZE(c->dns4) &&
inet_pton(AF_INET, p + 1, dns4))
if (dns4 - &c->dns4[0] < ARRAY_SIZE(c->dns4) - 1 &&
inet_pton(AF_INET, p + 1, dns4)) {
dns4++;
*dns4 = 0;
}
if (dns6 - &c->dns6[0] < ARRAY_SIZE(c->dns6) &&
inet_pton(AF_INET6, p + 1, dns6))
if (dns6 - &c->dns6[0] < ARRAY_SIZE(c->dns6) - 1 &&
inet_pton(AF_INET6, p + 1, dns6)) {
dns6++;
memset(dns6, 0, sizeof(*dns6));
}
} else if (!dnss_set && strstr(buf, "search ") == buf &&
s == c->dns_search) {
end = strpbrk(buf, "\n");
@ -560,10 +564,11 @@ static void get_dns(struct ctx *c)
*end = 0;
p = strtok(buf, " \t");
while ((p = strtok(NULL, " \t")) &&
s - c->dns_search < ARRAY_SIZE(c->dns_search)) {
while (s - c->dns_search < ARRAY_SIZE(c->dns_search) - 1
&& (p = strtok(NULL, " \t"))) {
strncpy(s->n, p, sizeof(c->dns_search[0]));
s++;
*s->n = 0;
}
}
}