Re: svn: /php/php-src/ branches/PHP_5_3/NEWS branches/PHP_5_3/Zend/zend_API.c trunk/NEWS trunk/Zend/zend_API.c

From: Date: Mon, 27 Feb 2012 08:00:58 +0000
Subject: Re: svn: /php/php-src/ branches/PHP_5_3/NEWS branches/PHP_5_3/Zend/zend_API.c trunk/NEWS trunk/Zend/zend_API.c
References: 1 2  Groups: php.cvs php.internals 
Request: Send a blank email to [email protected] to get a copy of this message 
Hi Laruence,

The attached patch looks wired. The patch on top of it (r323563) makes it better. However, in my opinion it fixes a common problem just in a single place. Each call to __toString() that makes "side effects" may cause the similar problem. It would be great to make a "right" fix in zend_std_cast_object_tostring() itself, but probably it would require API change (e.g. sending zval** instead of zval*). So it could be fixed properly only in trunk.

Thanks. Dmitry.

On 02/25/2012 08:41 AM, Laruence wrote:

Dmitry:

    you might want to review this fix.



    let me explain why crash before this fix.



    when doing parse_parameter,  then convert the object to string by

calling the ce->cast_object,


    and passed the same pointer(although there was a separation), to

the cast_object..


    then if __toString method stash $this somewhere, after the

parameters clean up,  the $this pointer will be impending..


    then in the next loop, the return_value will happen used the same adress,,



    then balalala, cause the segfault..



    sorry for my poor english,  and hope I have made myself clearly,

if there is any question , plz write me.

thanks

On Sat, Feb 25, 2012 at 12:36 PM, Xinchen Hui<[email protected]>  wrote:

laruence                                 Sat, 25 Feb 2012 04:36:08 +0000


Revision: http://svn.php.net/viewvc?view=revision&revision=323489

Log:
Fixed bug #61165 (Segfault - strip_tags())

Bug: https://bugs.php.net/61165 (Assigned) Segfault - strip_tags()

Changed paths:

    U   php/php-src/branches/PHP_5_3/NEWS
    U   php/php-src/branches/PHP_5_3/Zend/zend_API.c
    U   php/php-src/trunk/NEWS
    U   php/php-src/trunk/Zend/zend_API.c


Modified: php/php-src/branches/PHP_5_3/NEWS
===================================================================
--- php/php-src/branches/PHP_5_3/NEWS   2012-02-25 03:19:27 UTC (rev 323488)
+++ php/php-src/branches/PHP_5_3/NEWS   2012-02-25 04:36:08 UTC (rev 323489)
@@ -3,6 +3,7 @@
  ?? ??? 2012, PHP 5.3.11

  - Core:
+  . Fixed bug #61165 (Segfault - strip_tags()). (Laruence)
   . Improved max_input_vars directive to check nested variables (Dmitry).
   . Fixed bug #61095 (Incorect lexing of 0x00*+<NUM>). (Etienne)
   . Fixed bug #61072 (Memory leak when restoring an exception handler).

Modified: php/php-src/branches/PHP_5_3/Zend/zend_API.c
===================================================================

--- php/php-src/branches/PHP_5_3/Zend/zend_API.c        2012-02-25 03:19:27 UTC (rev 323488)
+++ php/php-src/branches/PHP_5_3/Zend/zend_API.c        2012-02-25 04:36:08 UTC (rev 323489)

@@ -254,10 +254,15 @@
  static int parse_arg_object_to_string(zval **arg TSRMLS_DC) /* {{{ */
  {

        if (Z_OBJ_HANDLER_PP(arg, cast_object)) {
-               SEPARATE_ZVAL_IF_NOT_REF(arg);
-               if (Z_OBJ_HANDLER_PP(arg, cast_object)(*arg, *arg, IS_STRING TSRMLS_CC) == SUCCESS) {
+               zval *obj;
+               ALLOC_ZVAL(obj);
+               MAKE_COPY_ZVAL(arg, obj);
+               if (Z_OBJ_HANDLER_P(*arg, cast_object)(*arg, obj, IS_STRING TSRMLS_CC) == SUCCESS) {
+                       zval_ptr_dtor(arg);
+                       *arg = obj;
                        return SUCCESS;
                }
+               zval_ptr_dtor(&obj);
        }
        /* Standard PHP objects */
        if (Z_OBJ_HT_PP(arg) ==&std_object_handlers || !Z_OBJ_HANDLER_PP(arg, cast_object)) {


Modified: php/php-src/trunk/NEWS
===================================================================

--- php/php-src/trunk/NEWS      2012-02-25 03:19:27 UTC (rev 323488)
+++ php/php-src/trunk/NEWS      2012-02-25 04:36:08 UTC (rev 323489)

@@ -6,6 +6,7 @@
   . World domination

  - Core:
+  . Fixed bug #61165 (Segfault - strip_tags()). (Laruence)
   . Fixed bug #61072 (Memory leak when restoring an exception handler).

     (Nikic, Laruence)

   . Fixed bug #61000 (Exceeding max nesting level doesn't delete numerical

Modified: php/php-src/trunk/Zend/zend_API.c
===================================================================
--- php/php-src/trunk/Zend/zend_API.c   2012-02-25 03:19:27 UTC (rev 323488)
+++ php/php-src/trunk/Zend/zend_API.c   2012-02-25 04:36:08 UTC (rev 323489)
@@ -262,12 +262,17 @@
  static int parse_arg_object_to_string(zval **arg, char **p, int *pl, int type TSRMLS_DC) /* {{{ */
  {

        if (Z_OBJ_HANDLER_PP(arg, cast_object)) {
-               SEPARATE_ZVAL_IF_NOT_REF(arg);
-               if (Z_OBJ_HANDLER_PP(arg, cast_object)(*arg, *arg, type TSRMLS_CC) == SUCCESS) {
+               zval *obj;
+               ALLOC_ZVAL(obj);
+               MAKE_COPY_ZVAL(arg, obj);
+               if (Z_OBJ_HANDLER_P(*arg, cast_object)(*arg, obj, type TSRMLS_CC) == SUCCESS) {
+                       zval_ptr_dtor(arg);
+                       *arg = obj;
                        *pl = Z_STRLEN_PP(arg);
                        *p = Z_STRVAL_PP(arg);
                        return SUCCESS;
                }
+               zval_ptr_dtor(&obj);
        }
        /* Standard PHP objects */
        if (Z_OBJ_HT_PP(arg) ==&std_object_handlers || !Z_OBJ_HANDLER_PP(arg, cast_object)) {



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