ntdll: Properly return errors when failing to unwind.

If libunwind is unavailable, make libunwind_virtual_unwind return an error. Likewise if there was no PE exception info and we didn't try unwinding using libunwind, we need to return an error when realizing we were unable to unwind, instead of just warning and returning success. This fixes hangs/infinite loops on crashes when unwinding fails. Signed-off-by: Martin Storsjo <martin@martin.st> Signed-off-by: André Hentschel <nerv@dawncrow.de> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

ntdll: Properly return errors when failing to unwind.
ea9f47a7 · Martin Storsjo · Alexandre Julliard · f3b64f95 · ea9f47a7
Commit ea9f47a7 authored Apr 10, 2020 by Martin Storsjo Committed by Alexandre Julliard Apr 22, 2020
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signal_arm64.c dlls/ntdll/signal_arm64.c +8 -2

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--- a/dlls/ntdll/signal_arm64.c
+++ b/dlls/ntdll/signal_arm64.c
@@ -597,8 +597,10 @@ static NTSTATUS libunwind_virtual_unwind( ULONG_PTR ip, ULONG_PTR *frame, CONTEX
          context->u.s.X24, context->u.s.X25, context->u.s.X26, context->u.s.X27 );
    TRACE(" x28=%016lx  fp=%016lx  lr=%016lx  sp=%016lx\n",
          context->u.s.X28, context->u.s.Fp, context->u.s.Lr, context->Sp );
-#endif
    return STATUS_SUCCESS;
+#else
+    return STATUS_INVALID_DISPOSITION;
+#endif
 }


@@ -645,7 +647,11 @@ static NTSTATUS virtual_unwind( ULONG type, DISPATCHER_CONTEXT *dispatch, CONTEX
            return STATUS_SUCCESS;
        }
    }
-    else WARN( "exception data not found in %s\n", debugstr_w(module->BaseDllName.Buffer) );
+    else
+    {
+        WARN( "exception data not found in %s\n", debugstr_w(module->BaseDllName.Buffer) );
+        return STATUS_INVALID_DISPOSITION;
+    }

    dispatch->EstablisherFrame = context->u.s.Fp;
    dispatch->LanguageHandler = NULL;