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32 lines
1.2 KiB
32 lines
1.2 KiB
From a11334f0eae67b5159a416193e2e37634281000a Mon Sep 17 00:00:00 2001
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From: Lennart Poettering <lennart@poettering.net>
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Date: Thu, 8 Nov 2018 09:33:31 +0100
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Subject: [PATCH] unit: make UNIT() cast function deal with NULL pointers
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Fixes: #10681
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(cherry picked from commit bbf11206230d1b089118971f98a047151cb5c4fa)
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Related: #1871827
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---
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src/core/unit.h | 7 ++++++-
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1 file changed, 6 insertions(+), 1 deletion(-)
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diff --git a/src/core/unit.h b/src/core/unit.h
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index 6e37fd6f5a..ec45b5fb48 100644
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--- a/src/core/unit.h
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+++ b/src/core/unit.h
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@@ -597,7 +597,12 @@ extern const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX];
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}
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/* For casting the various unit types into a unit */
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-#define UNIT(u) (&(u)->meta)
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+#define UNIT(u) \
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+ ({ \
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+ typeof(u) _u_ = (u); \
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+ Unit *_w_ = _u_ ? &(_u_)->meta : NULL; \
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+ _w_; \
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+ })
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#define UNIT_HAS_EXEC_CONTEXT(u) (UNIT_VTABLE(u)->exec_context_offset > 0)
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#define UNIT_HAS_CGROUP_CONTEXT(u) (UNIT_VTABLE(u)->cgroup_context_offset > 0)
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