dns: Fix server_idx overflow to DNS_MAX_SERVERS triggering LWIP_ASSERT

9247429 dns: Fix server_idx increasing to DNS_MAX_SERVERS and trigger the LWIP_ASSERT
espressif · Sep 10, 2024 · 5861ff0 · 5861ff0
1 parent c97293f
commit 5861ff0
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/src/core/dns.c b/src/core/dns.c
@@ -1104,8 +1104,8 @@ dns_check_entry(u8_t i)
       entry->tmr = 1;
       entry->retries = 0;
 #if ESP_DNS
-      while((entry->server_idx < DNS_MAX_SERVERS) && ip_addr_isany_val(dns_servers[entry->server_idx])) {
-        entry->server_idx++;
+      while((entry->server_idx + 1 < DNS_MAX_SERVERS) && ip_addr_isany_val(dns_servers[entry->server_idx])) {
+        entry->server_idx ++;
       }
 #endif
       /* send DNS packet for this entry */