Make stack check work if stack is a small value.

cee9a0f2 · Glenn Wurster · Alexandre Julliard · f1853ba1 · cee9a0f2
Commit cee9a0f2 authored Aug 25, 2005 by Glenn Wurster Committed by Alexandre Julliard Aug 25, 2005
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signal_i386.c dlls/ntdll/signal_i386.c +2 -1

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--- a/dlls/ntdll/signal_i386.c
+++ b/dlls/ntdll/signal_i386.c
@@ -761,7 +761,8 @@ static EXCEPTION_RECORD *setup_exception( SIGCONTEXT *sigcontext, raise_func fun
        server_abort_thread(1);
    }

-    if ((char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit + 4096 ||
+    if (stack - 1 > stack || /* check for overflow in subtraction */
+        (char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit + 4096 ||
        (char *)stack > (char *)NtCurrentTeb()->Tib.StackBase)
    {
        UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit + 4096 - (char *)stack;