From 89832cde4eb2e8d2dc9570cf4840fcaff19b8429 Mon Sep 17 00:00:00 2001
From: Stefan Leichter <Stefan.Leichter@camline.com>
Date: Sun, 1 Dec 2013 22:07:20 +0100
Subject: [PATCH] dbghelp: Add a null check for optional output parameter for
 function SymFromAddr.

---
 dlls/dbghelp/symbol.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/dlls/dbghelp/symbol.c b/dlls/dbghelp/symbol.c
index e6401a9d624..8c482c7cee8 100644
--- a/dlls/dbghelp/symbol.c
+++ b/dlls/dbghelp/symbol.c
@@ -1229,7 +1229,8 @@ BOOL WINAPI SymFromAddr(HANDLE hProcess, DWORD64 Address,
     if ((sym = symt_find_nearest(pair.effective, Address)) == NULL) return FALSE;
 
     symt_fill_sym_info(&pair, NULL, &sym->symt, Symbol);
-    *Displacement = Address - Symbol->Address;
+    if (Displacement)
+        *Displacement = Address - Symbol->Address;
     return TRUE;
 }