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Diffstat (limited to 'src/plugins/dns/dns.c')
-rw-r--r--src/plugins/dns/dns.c28
1 files changed, 18 insertions, 10 deletions
diff --git a/src/plugins/dns/dns.c b/src/plugins/dns/dns.c
index 4a283bf298f..d07a1dac43b 100644
--- a/src/plugins/dns/dns.c
+++ b/src/plugins/dns/dns.c
@@ -38,6 +38,19 @@
dns_main_t dns_main;
+/* the cache hashtable expects a NULL-terminated C-string but everywhere else
+ * expects a non-NULL terminated vector... The pattern of adding \0 but hiding
+ * it away drives AddressSanitizer crazy, this helper tries to bring some of
+ * its sanity back
+ */
+static_always_inline void
+dns_terminate_c_string (u8 **v)
+{
+ vec_add1 (*v, 0);
+ vec_dec_len (*v, 1);
+ clib_mem_unpoison (vec_end (*v), 1);
+}
+
static int
dns_cache_clear (dns_main_t * dm)
{
@@ -826,8 +839,8 @@ re_resolve:
pool_get (dm->entries, ep);
clib_memset (ep, 0, sizeof (*ep));
- ep->name = format (0, "%s%c", name, 0);
- vec_set_len (ep->name, vec_len (ep->name) - 1);
+ ep->name = format (0, "%s", name);
+ dns_terminate_c_string (&ep->name);
hash_set_mem (dm->cache_entry_by_name, ep->name, ep - dm->entries);
@@ -985,8 +998,7 @@ found_last_request:
now = vlib_time_now (vm);
cname = vnet_dns_labels_to_name (rr->rdata, reply, &pos2);
/* Save the cname */
- vec_add1 (cname, 0);
- vec_dec_len (cname, 1);
+ dns_terminate_c_string (&cname);
ep = pool_elt_at_index (dm->entries, ep_index);
ep->cname = cname;
ep->flags |= (DNS_CACHE_ENTRY_FLAG_CNAME | DNS_CACHE_ENTRY_FLAG_VALID);
@@ -1004,8 +1016,7 @@ found_last_request:
clib_memset (next_ep, 0, sizeof (*next_ep));
next_ep->name = vec_dup (cname);
- vec_add1 (next_ep->name, 0);
- vec_dec_len (next_ep->name, 1);
+ dns_terminate_c_string (&next_ep->name);
hash_set_mem (dm->cache_entry_by_name, next_ep->name,
next_ep - dm->entries);
@@ -2607,10 +2618,7 @@ test_dns_expire_command_fn (vlib_main_t * vm,
dns_cache_entry_t *ep;
if (unformat (input, "%v", &name))
- {
- vec_add1 (name, 0);
- vec_dec_len (name, 1);
- }
+ dns_terminate_c_string (&name);
else
return clib_error_return (0, "no name provided");