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Fixed race condition in hostentry allocation

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This commit is contained in:
Maria Matejka 2023-04-27 12:38:50 +02:00
parent 9bc5cbd3c7
commit 91471531a1
1 changed files with 46 additions and 3 deletions
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49
nest/rt-table.c
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@ -4831,6 +4831,39 @@ rt_update_hostcache(void *data)
rt_schedule_nhu(dst);
}
struct hostentry_tmp_lock {
resource r;
rtable *tab;
struct hostentry *he;
};
static void
hostentry_tmp_unlock(resource *r)
{
struct hostentry_tmp_lock *l = SKIP_BACK(struct hostentry_tmp_lock, r, r);
RT_LOCKED(l->tab, tab)
{
l->he->uc--;
rt_unlock_table(tab);
}
}
static void
hostentry_tmp_lock_dump(resource *r, unsigned indent UNUSED)
{
struct hostentry_tmp_lock *l = SKIP_BACK(struct hostentry_tmp_lock, r, r);
debug("he=%p tab=%s\n", l->he, l->tab->name);
}
struct resclass hostentry_tmp_lock_class = {
.name = "Temporary hostentry lock",
.size = sizeof(struct hostentry_tmp_lock),
.free = hostentry_tmp_unlock,
.dump = hostentry_tmp_lock_dump,
.lookup = NULL,
.memsize = NULL,
};
static struct hostentry *
rt_get_hostentry(struct rtable_private *tab, ip_addr a, ip_addr ll, rtable *dep)
{
@ -4844,10 +4877,20 @@ rt_get_hostentry(struct rtable_private *tab, ip_addr a, ip_addr ll, rtable *dep)
struct hostcache *hc = tab->hostcache;
for (he = hc->hash_table[k >> hc->hash_shift]; he != NULL; he = he->next)
if (ipa_equal(he->addr, a) && ipa_equal(he->link, link) && (he->tab == dep))
return he;
break;
if (!he)
{
he = hc_new_hostentry(hc, tab->rp, a, link, dep, k);
rt_update_hostentry(tab, he);
}
struct hostentry_tmp_lock *l = ralloc(tmp_res.pool, &hostentry_tmp_lock_class);
l->he = he;
l->tab = RT_PUB(tab);
l->he->uc++;
rt_lock_table(tab);
he = hc_new_hostentry(hc, tab->rp, a, link, dep, k);
rt_update_hostentry(tab, he);
return he;
}