Merge branch 'PHP-5.6' into PHP-7.0

* PHP-5.6:
  fix #72519, possible OOB using imagegif
  fix #72512, invalid read or write for palette image when invalid transparent index is used
  Apparently some envs miss SIZE_MAX
  Fix tests
  Fix bug #72618: NULL Pointer Dereference in exif_process_user_comment
  Partial fix for bug #72613 - do not treat negative returns from bz2 as size_t
  Fix bug #72606: heap-buffer-overflow (write) simplestring_addn simplestring.c
  Fix for bug #72558, Integer overflow error within _gdContributionsAlloc()
  Fix bug #72603: Out of bound read in exif_process_IFD_in_MAKERNOTE
  Fix bug #72562 - destroy var_hash properly
  Fix bug #72533 (locale_accept_from_http out-of-bounds access)
  Fix fir bug #72520
  Fix for bug #72513
  Fix for bug #72513
  CS fix and comments with bug ID
  Fix for HTTP_PROXY issue.
  5.6.24RC1
  add tests for bug #72512
  Fixed bug #72512 gdImageTrueColorToPaletteBody allows arbitrary write/read access
  Fixed bug #72479 - same as #72434

Conflicts:
	Zend/zend_virtual_cwd.c
	ext/bz2/bz2.c
	ext/exif/exif.c
	ext/session/session.c
	ext/snmp/snmp.c
	ext/standard/basic_functions.c
	main/SAPI.c
	main/php_variables.c

2 files changed, 21 insertions, 5 deletions

diff --git a/ext/xmlrpc/libxmlrpc/simplestring.c b/ext/xmlrpc/libxmlrpc/simplestring.c
index 026567e5f5..c88754fb9a 100644
--- a/ext/xmlrpc/libxmlrpc/simplestring.c
+++ b/ext/xmlrpc/libxmlrpc/simplestring.c
@@ -172,6 +172,9 @@ void simplestring_free(simplestring* string) {
 }
 /******/
 
+#ifndef SIZE_MAX
+#define SIZE_MAX ((size_t)-1)
+#endif
 /****f* FUNC/simplestring_addn
  * NAME
  *   simplestring_addn
@@ -190,18 +193,31 @@ void simplestring_free(simplestring* string) {
  *   simplestring_add ()
  * SOURCE
  */
-void simplestring_addn(simplestring* target, const char* source, int add_len) {
+void simplestring_addn(simplestring* target, const char* source, size_t add_len) {
+   size_t newsize = target->size, incr = 0;
    if(target && source) {
       if(!target->str) {
          simplestring_init_str(target);
       }
+
+      if((SIZE_MAX - add_len) < target->len || (SIZE_MAX - add_len - 1) < target->len) {
+    	  /* check for overflows, if there's a potential overflow do nothing */
+    	  return;
+      }
+
       if(target->len + add_len + 1 > target->size) {
          /* newsize is current length + new length */
-         int newsize = target->len + add_len + 1;
-         int incr = target->size * 2;
+         newsize = target->len + add_len + 1;
+         incr = target->size * 2;
 
          /* align to SIMPLESTRING_INCR increments */
-         newsize = newsize - (newsize % incr) + incr;
+         if (incr) {
+            newsize = newsize - (newsize % incr) + incr;
+         }
+         if(newsize < (target->len + add_len + 1)) {
+        	 /* some kind of overflow happened */
+        	 return;
+         }
          target->str = (char*)realloc(target->str, newsize);
 
          target->size = target->str ? newsize : 0;
diff --git a/ext/xmlrpc/libxmlrpc/simplestring.h b/ext/xmlrpc/libxmlrpc/simplestring.h
index 59186a7764..b46b0d779a 100644
--- a/ext/xmlrpc/libxmlrpc/simplestring.h
+++ b/ext/xmlrpc/libxmlrpc/simplestring.h
@@ -63,7 +63,7 @@ void simplestring_init(simplestring* string);
 void simplestring_clear(simplestring* string);
 void simplestring_free(simplestring* string);
 void simplestring_add(simplestring* string, const char* add);
-void simplestring_addn(simplestring* string, const char* add, int add_len);
+void simplestring_addn(simplestring* string, const char* add, size_t add_len);
 
 #ifdef __cplusplus
 }