Sebastian Lackner : server: Explicitly mark memory as undefined in mem_alloc wrapper.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 332d59215846e773375b9bd02411c0de63055953
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=332d59215846e773375b9bd02411c0de63055953

Author: Sebastian Lackner <sebastian at fds-team.de>
Date:   Wed Mar  8 04:40:47 2017 +0100

server: Explicitly mark memory as undefined in mem_alloc wrapper.

Signed-off-by: Sebastian Lackner <sebastian at fds-team.de>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

 server/object.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/server/object.c b/server/object.c
index ad22ec1..e43fe3f 100644
--- a/server/object.c
+++ b/server/object.c
@@ -28,6 +28,9 @@
 #include <string.h>
 #include <unistd.h>
 #include <stdarg.h>
+#ifdef HAVE_VALGRIND_MEMCHECK_H
+#include <valgrind/memcheck.h>
+#endif
 
 #include "ntstatus.h"
 #define WIN32_NO_STATUS
@@ -92,11 +95,22 @@ void close_objects(void)
 
 /*****************************************************************/
 
+/* mark a block of memory as uninitialized for debugging purposes */
+static inline void mark_block_uninitialized( void *ptr, size_t size )
+{
+    memset( ptr, 0x55, size );
+#if defined(VALGRIND_MAKE_MEM_UNDEFINED)
+    VALGRIND_DISCARD( VALGRIND_MAKE_MEM_UNDEFINED( ptr, size ));
+#elif defined(VALGRIND_MAKE_WRITABLE)
+    VALGRIND_DISCARD( VALGRIND_MAKE_WRITABLE( ptr, size ));
+#endif
+}
+
 /* malloc replacement */
 void *mem_alloc( size_t size )
 {
     void *ptr = malloc( size );
-    if (ptr) memset( ptr, 0x55, size );
+    if (ptr) mark_block_uninitialized( ptr, size );
     else set_error( STATUS_NO_MEMORY );
     return ptr;
 }