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Code Issues Releases Wiki Activity

two dns_name_dup calls were not checked

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This commit is contained in:
Mark Andrews
2018-10-29 18:04:54 +11:00
committed by Evan Hunt
parent ce5ac790bb
commit 99b25eb379
1 changed files with 33 additions and 8 deletions
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41
lib/dns/resolver.c
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@@ -586,7 +586,7 @@ static void resquery_response(isc_task_t *task, isc_event_t *event);
static void resquery_connected(isc_task_t *task, isc_event_t *event);
static void fctx_try(fetchctx_t *fctx, bool retrying,
bool badcache);
void fctx_minimize_qname(fetchctx_t *fctx);
static isc_result_t fctx_minimize_qname(fetchctx_t *fctx);
static void fctx_destroy(fetchctx_t *fctx);
static bool fctx_unlink(fetchctx_t *fctx);
static isc_result_t ncache_adderesult(dns_message_t *message,
@@ -4142,7 +4142,13 @@ resume_qmin(isc_task_t *task, isc_event_t *event) {
}
fctx->ns_ttl = fctx->nameservers.ttl;
fctx->ns_ttl_ok = true;
fctx_minimize_qname(fctx);
result = fctx_minimize_qname(fctx);
if (result != ISC_R_SUCCESS) {
fctx_done(fctx, result, __LINE__);
goto cleanup;
}
if (!fctx->minimized) {
/*
* We have finished minimizing, but fctx->finds was filled at
@@ -4152,6 +4158,7 @@ resume_qmin(isc_task_t *task, isc_event_t *event) {
fctx_cancelqueries(fctx, false, false);
fctx_cleanupall(fctx);
}
fctx_try(fctx, true, false);
cleanup:
@@ -4903,7 +4910,10 @@ fctx_create(dns_resolver_t *res, const dns_name_t *name, dns_rdatatype_t type,
fctx->ip6arpaskip =
(options & DNS_FETCHOPT_QMIN_SKIP_IP6A) != 0 &&
dns_name_issubdomain(&fctx->name, &ip6_arpa);
fctx_minimize_qname(fctx);
result = fctx_minimize_qname(fctx);
if (result != ISC_R_SUCCESS) {
goto cleanup_mctx;
}
}
ISC_LIST_APPEND(res->buckets[bucketnum].fctxs, fctx, link);
@@ -4917,6 +4927,13 @@ fctx_create(dns_resolver_t *res, const dns_name_t *name, dns_rdatatype_t type,
return (ISC_R_SUCCESS);
cleanup_mctx:
fctx->magic = 0;
isc_mem_detach(&fctx->mctx);
dns_adb_detach(&fctx->adb);
dns_db_detach(&fctx->cache);
isc_timer_detach(&fctx->timer);
cleanup_rmessage:
dns_message_destroy(&fctx->rmessage);
@@ -10329,19 +10346,24 @@ log_fetch(const dns_name_t *name, dns_rdatatype_t type) {
"fetch: %s/%s", namebuf, typebuf);
}
void
static isc_result_t
fctx_minimize_qname(fetchctx_t *fctx) {
isc_result_t result;
unsigned int dlabels, nlabels;
REQUIRE(VALID_FCTX(fctx));
dlabels = dns_name_countlabels(&fctx->qmindcname);
nlabels = dns_name_countlabels(&fctx->name);
dns_name_free(&fctx->qminname, fctx->mctx);
dns_name_init(&fctx->qminname, NULL);
if (dlabels > fctx->qmin_labels) {
fctx->qmin_labels = dlabels+1;
fctx->qmin_labels = dlabels + 1;
} else {
fctx->qmin_labels++;
}
if (fctx->ip6arpaskip) {
/*
* For ip6.arpa we want to skip some of the labels, with
@@ -10366,6 +10388,7 @@ fctx_minimize_qname(fetchctx_t *fctx) {
} else if (fctx->qmin_labels > DNS_QMIN_MAXLABELS) {
fctx->qmin_labels = DNS_MAX_LABELS + 1;
}
if (fctx->qmin_labels < nlabels) {
/*
* We want to query for qmin_labels from fctx->name
@@ -10375,16 +10398,18 @@ fctx_minimize_qname(fetchctx_t *fctx) {
dns_name_split(&fctx->name,
fctx->qmin_labels,
NULL, dns_fixedname_name(&fname));
dns_name_dup(dns_fixedname_name(&fname), fctx->mctx,
&fctx->qminname);
result = dns_name_dup(dns_fixedname_name(&fname), fctx->mctx,
&fctx->qminname);
fctx->qmintype = dns_rdatatype_ns;
fctx->minimized = true;
} else {
/* Minimization is done, we'll ask for whole qname */
fctx->qmintype = fctx->type;
dns_name_dup(&fctx->name, fctx->mctx, &fctx->qminname);
result = dns_name_dup(&fctx->name, fctx->mctx, &fctx->qminname);
fctx->minimized = false;
}
return (result);
}
isc_result_t