[Bug 7214] wine_dbg_vprintf: debugstr buffer overflow (contents: 'err:msvcrt:demangle_datatype Unknown type ')

[Wine Bugs]

http://bugs.winehq.org/show_bug.cgi?id=7214

------- Additional Comments From [e-mail]  2007-21-01 13:18 -------
> Does the same apply when you rebuild from scratch ?

I always do a "rebuild all" , which compiles everything from scratch.

I'm not sure whether it's a bug that 'dt' is zero in demangle_datatype, but that
seems to be the reason it crashes, when it tries to print the error. The crash
is easy to reproduce (very dumb example):

1. For example apply the patch below:

diff --git a/dlls/kernel32/sync.c b/dlls/kernel32/sync.c
index eaa0f70..4bf86d5 100644
--- a/dlls/kernel32/sync.c
+++ b/dlls/kernel32/sync.c
@@ -86,7 +86,12 @@ HANDLE get_BaseNamedObjects_handle(void)
  *              Sleep  (KERNEL32.@)
  */
 VOID WINAPI Sleep( DWORD timeout )
-{
+{char c;
+int i;
+c=0;
+for(i=0;i<100;i++)
+ERR("this will crash %c\n",c);
+
     SleepEx( timeout, FALSE );
 }

2. Run the following program:

#include "windows.h"
int main()
{
Sleep(10);
}

You'll get the same crash...