From b1ccbdad7bef41c105b78384eafbf509af91fa36 Mon Sep 17 00:00:00 2001
From: Igor Sysoev <igor@sysoev.ru>
Date: Thu, 19 Jul 2007 19:11:57 +0000
Subject: [PATCH] fix potential double free(), found by Coverity's Scan

---
 src/core/ngx_file.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/core/ngx_file.c b/src/core/ngx_file.c
index 55cfd7ca2..fcb8ff080 100644
--- a/src/core/ngx_file.c
+++ b/src/core/ngx_file.c
@@ -518,6 +518,9 @@ ngx_walk_tree(ngx_tree_ctx_t *ctx, ngx_str_t *tree)
         }
 
         ctx->data = data;
+
+    } else {
+        data = NULL;
     }
 
     for ( ;; ) {
@@ -643,8 +646,8 @@ done:
         ngx_free(buf.data);
     }
 
-    if (ctx->alloc) {
-        ngx_free(ctx->data);
+    if (data) {
+        ngx_free(data);
         ctx->data = prev;
     }