[tfaber] 57092: [NTDLL:LDR] - Do not assume null termination of DllName and optimize extension search in LdrpLoadDll. Patch by Alexander Yastrebov (menone7 at gmail dot com). See issue #7251 for mo...

Author: tfaber
Date: Sat Aug 18 07:56:45 2012
New Revision: 57092

URL: http://svn.reactos.org/svn/reactos?rev=57092&view=rev
Log:
[NTDLL:LDR]
- Do not assume null termination of DllName and optimize extension search in LdrpLoadDll.
Patch by Alexander Yastrebov (menone7 at gmail dot com).
See issue #7251 for more details.

Modified:
    trunk/reactos/dll/ntdll/ldr/ldrutils.c

Modified: trunk/reactos/dll/ntdll/ldr/ldrutils.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/dll/ntdll/ldr/ldrutils.c?r…
==============================================================================
--- trunk/reactos/dll/ntdll/ldr/ldrutils.c [iso-8859-1] (original)
+++ trunk/reactos/dll/ntdll/ldr/ldrutils.c [iso-8859-1] Sat Aug 18 07:56:45 2012
@@ -2415,37 +2415,38 @@
 {
     PPEB Peb = NtCurrentPeb();
     NTSTATUS Status = STATUS_SUCCESS;
-    PWCHAR p1, p2;
+    PWCHAR p1, p2, p1min;
     WCHAR c;
-    WCHAR NameBuffer[266];
+    WCHAR NameBuffer[MAX_PATH+6];
     LPWSTR RawDllName;
     UNICODE_STRING RawDllNameString;
     PLDR_DATA_TABLE_ENTRY LdrEntry;
     BOOLEAN InInit = LdrpInLdrInit;
 
-    /* Find the name without the extension */
-    p1 = DllName->Buffer;
-    p2 = NULL;
-    while (*p1)
-    {
-        c = *p1++;
-        if (c == L'.')
-        {
-            p2 = p1;
-        }
-        else if (c == L'\\')
-        {
-            p2 = NULL;
-        }
-    }
-
     /* Save the Raw DLL Name */
     RawDllName = NameBuffer;
     if (DllName->Length >= sizeof(NameBuffer)) return STATUS_NAME_TOO_LONG;
     RtlMoveMemory(RawDllName, DllName->Buffer, DllName->Length);
 
-    /* Check if no extension was found or if we got a slash */
-    if (!(p2) || (*p2 == '\\'))
+    /* Find the name without the extension */
+    p1 = DllName->Buffer + DllName->Length / sizeof(WCHAR) - 1;
+    p2 = NULL;
+    for (p1min = DllName->Buffer; p1 >= p1min; p1--)
+    {
+        c = *p1;
+        if (c == L'.')
+        {
+            p2 = p1;
+            break;
+        }
+        else if (c == L'\\')
+        {
+            break;
+        }
+    }
+
+    /* Check if no extension was found */
+    if (!p2)
     {
         /* Check that we have space to add one */
         if ((DllName->Length + LdrApiDefaultExtension.Length + sizeof(UNICODE_NULL))
>=