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conf: Move DNS array bounds checks into add_dns[46]

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Every time we call add_dns[46] we need to first check if there's space in
the c->ip[46].dns array for the new entry.  We might as well make that
check in add_dns[46]() itself.

In fact it looks like the calls in get_dns() had an off by one error, not
allowing the last entry of the array to be filled.  So, that bug is also
fixed by the change.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
David Gibson 2024-08-21 14:20:03 +10:00 committed by Stefano Brivio
parent 6852bd07cc
commit 1d10760c9f
1 changed files with 10 additions and 8 deletions
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18
conf.c
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@ -363,6 +363,9 @@ static unsigned add_dns4(struct ctx *c, const struct in_addr *addr,
{
unsigned added = 0;
if (idx >= ARRAY_SIZE(c->ip4.dns))
return 0;
/* Guest or container can only access local addresses via redirect */
if (IN4_IS_ADDR_LOOPBACK(addr)) {
if (!c->no_map_gw) {
@ -395,6 +398,9 @@ static unsigned add_dns6(struct ctx *c, struct in6_addr *addr, unsigned idx)
{
unsigned added = 0;
if (idx >= ARRAY_SIZE(c->ip6.dns))
return 0;
/* Guest or container can only access local addresses via redirect */
if (IN6_IS_ADDR_LOOPBACK(addr)) {
if (!c->no_map_gw) {
@ -453,12 +459,10 @@ static void get_dns(struct ctx *c)
if (end)
*end = 0;
if (!dns4_set && dns4_idx < ARRAY_SIZE(c->ip4.dns) - 1
&& inet_pton(AF_INET, p + 1, &dns4_tmp))
if (!dns4_set && inet_pton(AF_INET, p + 1, &dns4_tmp))
dns4_idx += add_dns4(c, &dns4_tmp, dns4_idx);
if (!dns6_set && dns6_idx < ARRAY_SIZE(c->ip6.dns) - 1
&& inet_pton(AF_INET6, p + 1, &dns6_tmp))
if (!dns6_set && inet_pton(AF_INET6, p + 1, &dns6_tmp))
dns6_idx += add_dns6(c, &dns6_tmp, dns6_idx);
} else if (!dnss_set && strstr(line, "search ") == line &&
s == c->dns_search) {
@ -1682,14 +1686,12 @@ void conf(struct ctx *c, int argc, char **argv)
c->no_dns = 0;
if (dns4_idx < ARRAY_SIZE(c->ip4.dns) &&
inet_pton(AF_INET, optarg, &dns4_tmp)) {
if (inet_pton(AF_INET, optarg, &dns4_tmp)) {
dns4_idx += add_dns4(c, &dns4_tmp, dns4_idx);
continue;
}
if (dns6_idx < ARRAY_SIZE(c->ip6.dns) &&
inet_pton(AF_INET6, optarg, &dns6_tmp)) {
if (inet_pton(AF_INET6, optarg, &dns6_tmp)) {
dns6_idx += add_dns6(c, &dns6_tmp, dns6_idx);
continue;
}