Eric Pouech : dbghelp: SymSetContext should return FALSE when setting twice the same

[Alexandre Julliard]

Module: wine
Branch: refs/heads/master
Commit: e5d09bf374bdfecee2f176bf53956c6f40222118
URL:    http://source.winehq.org/git/?p=wine.git;a=commit;h=e5d09bf374bdfecee2f176bf53956c6f40222118

Author: Eric Pouech <eric.pouech at wanadoo.fr>
Date:   Mon Jan 23 16:30:25 2006 +0100

dbghelp: SymSetContext should return FALSE when setting twice the same
frame context.

---

 dlls/dbghelp/dbghelp.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/dlls/dbghelp/dbghelp.c b/dlls/dbghelp/dbghelp.c
index 66d687d..289e113 100644
--- a/dlls/dbghelp/dbghelp.c
+++ b/dlls/dbghelp/dbghelp.c
@@ -338,6 +338,18 @@ BOOL WINAPI SymSetContext(HANDLE hProces
     struct process* pcs = process_find_by_handle(hProcess);
     if (!pcs) return FALSE;
 
+    if (pcs->ctx_frame.ReturnOffset == StackFrame->ReturnOffset &&
+        pcs->ctx_frame.FrameOffset  == StackFrame->FrameOffset  &&
+        pcs->ctx_frame.StackOffset  == StackFrame->StackOffset)
+    {
+        TRACE("Setting same frame {rtn=%s frm=%s stk=%s}\n",
+              wine_dbgstr_longlong(pcs->ctx_frame.ReturnOffset),
+              wine_dbgstr_longlong(pcs->ctx_frame.FrameOffset),
+              wine_dbgstr_longlong(pcs->ctx_frame.StackOffset));
+        SetLastError(ERROR_ACCESS_DENIED); /* latest MSDN says ERROR_SUCCESS */
+        return FALSE;
+    }
+
     pcs->ctx_frame = *StackFrame;
     /* MSDN states that Context is not (no longer?) used */
     return TRUE;