[nginx] svn commit: r4424 - trunk/src/core

[vbart at nginx.com]

Author: vbart
Date: 2012-01-30 12:53:57 +0000 (Mon, 30 Jan 2012)
New Revision: 4424

Modified:
   trunk/src/core/ngx_regex.c
Log:
Fixed memory leak on HUP signal when PCRE JIT was used.

The PCRE JIT compiler uses mmap to allocate memory for its executable codes, so
we have to explicitly call the pcre_free_study() function to free this memory.


Modified: trunk/src/core/ngx_regex.c
===================================================================
--- trunk/src/core/ngx_regex.c	2012-01-30 11:22:56 UTC (rev 4423)
+++ trunk/src/core/ngx_regex.c	2012-01-30 12:53:57 UTC (rev 4424)
@@ -16,6 +16,9 @@
 
 static void * ngx_libc_cdecl ngx_regex_malloc(size_t size);
 static void ngx_libc_cdecl ngx_regex_free(void *p);
+#if (NGX_HAVE_PCRE_JIT)
+static void ngx_pcre_free_studies(void *data);
+#endif
 
 static ngx_int_t ngx_regex_module_init(ngx_cycle_t *cycle);
 
@@ -274,6 +277,41 @@
 }
 
 
+#if (NGX_HAVE_PCRE_JIT)
+
+static void
+ngx_pcre_free_studies(void *data)
+{
+    ngx_list_t *studies = data;
+
+    ngx_uint_t        i;
+    ngx_list_part_t  *part;
+    ngx_regex_elt_t  *elts;
+
+    part = &studies->part;
+    elts = part->elts;
+
+    for (i = 0 ; /* void */ ; i++) {
+
+        if (i >= part->nelts) {
+            if (part->next == NULL) {
+                break;
+            }
+
+            part = part->next;
+            elts = part->elts;
+            i = 0;
+        }
+
+        if (elts[i].regex->extra != NULL) {
+            pcre_free_study(elts[i].regex->extra);
+        }
+    }
+}
+
+#endif
+
+
 static ngx_int_t
 ngx_regex_module_init(ngx_cycle_t *cycle)
 {
@@ -287,12 +325,27 @@
 
 #if (NGX_HAVE_PCRE_JIT)
     {
-    ngx_regex_conf_t  *rcf;
+    ngx_regex_conf_t    *rcf;
+    ngx_pool_cleanup_t  *cln;
 
     rcf = (ngx_regex_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_regex_module);
 
     if (rcf->pcre_jit) {
         opt = PCRE_STUDY_JIT_COMPILE;
+
+        /*
+         * The PCRE JIT compiler uses mmap for its executable codes, so we
+         * have to explicitly call the pcre_free_study() function to free
+         * this memory.
+         */
+
+        cln = ngx_pool_cleanup_add(cycle->pool, 0);
+        if (cln == NULL) {
+            return NGX_ERROR;
+        }
+
+        cln->handler = ngx_pcre_free_studies;
+        cln->data = ngx_pcre_studies;
     }
     }
 #endif