[PATCH] ntdll: Use a dynamically allocated buffer in find_forwarded_export() if necessary.

[Zebediah Figura]

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=50105
Signed-off-by: Zebediah Figura 
---
 dlls/ntdll/loader.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/dlls/ntdll/loader.c b/dlls/ntdll/loader.c
index 368448c9f8d..ff5a175027c 100644
--- a/dlls/ntdll/loader.c
+++ b/dlls/ntdll/loader.c
@@ -608,19 +608,20 @@ static FARPROC find_forwarded_export( HMODULE module, const char *forward, LPCWS
     const IMAGE_EXPORT_DIRECTORY *exports;
     DWORD exp_size;
     WINE_MODREF *wm;
-    WCHAR mod_name[32];
+    WCHAR buffer[32], *mod_name = buffer;
     const char *end = strrchr(forward, '.');
     FARPROC proc = NULL;

if (!end) return NULL;
-    if ((end - forward) * sizeof(WCHAR) >= sizeof(mod_name)) return NULL;
+    if ((end - forward) * sizeof(WCHAR) > sizeof(buffer) - sizeof(dllW))
+    {
+        if (!(mod_name = RtlAllocateHeap( GetProcessHeap(), 0, (end - forward + sizeof(dllW)) * sizeof(WCHAR) )))
+            return NULL;
+    }
     ascii_to_unicode( mod_name, forward, end - forward );
     mod_name[end - forward] = 0;
     if (!wcschr( mod_name, '.' ))
-    {
-        if ((end - forward) * sizeof(WCHAR) >= sizeof(mod_name) - sizeof(dllW)) return NULL;
         memcpy( mod_name + (end - forward), dllW, sizeof(dllW) );
-    }

if (!(wm = find_basename_module( mod_name )))
     {
@@ -642,6 +643,7 @@ static FARPROC find_forwarded_export( HMODULE module, const char *forward, LPCWS

if (!wm)
         {
+            if (mod_name != buffer) RtlFreeHeap( GetProcessHeap(), 0, mod_name );
             ERR( "module not found for forward '%s' used by %s\n",
                  forward, debugstr_w(get_modref(module)->ldr.FullDllName.Buffer) );
             return NULL;
@@ -664,6 +666,7 @@ static FARPROC find_forwarded_export( HMODULE module, const char *forward, LPCWS
             forward, debugstr_w(get_modref(module)->ldr.FullDllName.Buffer),
             debugstr_w(get_modref(module)->ldr.BaseDllName.Buffer) );
     }
+    if (mod_name != buffer) RtlFreeHeap( GetProcessHeap(), 0, mod_name );
     return proc;
 }

[Marvin]

Hi,

While running your changed tests, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?

Full results can be found at:
https://testbot.winehq.org/JobDetails.pl?Key=82280

Your paranoid android.

=== debiant (32 bit report) ===

ntdll:
threadpool.c:1904: Test failed: WaitForSingleObject returned 258