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diff src/http/modules/ngx_http_limit_conn_module.c @ 4497:95ab6658654a

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Fix of rbtree lookup on hash collisions. Previous code incorrectly assumed that nodes with identical keys are linked together. This might not be true after tree rebalance. Patch by Lanshun Zhou.
author Maxim Dounin <mdounin@mdounin.ru>
date Mon, 27 Feb 2012 22:15:39 +0000
parents 2d4ff8bd5649
children 778ef9c3fd2d
line wrap: on
line diff
--- a/src/http/modules/ngx_http_limit_conn_module.c
+++ b/src/http/modules/ngx_http_limit_conn_module.c
@@ -325,20 +325,15 @@ ngx_http_limit_conn_lookup(ngx_rbtree_t 
 
         /* hash == node->key */
 
-        do {
-            lcn = (ngx_http_limit_conn_node_t *) &node->color;
+        lcn = (ngx_http_limit_conn_node_t *) &node->color;
 
-            rc = ngx_memn2cmp(vv->data, lcn->data,
-                              (size_t) vv->len, (size_t) lcn->len);
-            if (rc == 0) {
-                return node;
-            }
+        rc = ngx_memn2cmp(vv->data, lcn->data,
+                          (size_t) vv->len, (size_t) lcn->len);
+        if (rc == 0) {
+            return node;
+        }
 
-            node = (rc < 0) ? node->left : node->right;
-
-        } while (node != sentinel && hash == node->key);
-
-        break;
+        node = (rc < 0) ? node->left : node->right;
     }
 
     return NULL;