[PATCH AUTOSEL 5.14 01/18] KVM: arm64: Report corrupted refcount at EL2
From: Sasha Levin <sashal@kernel.org>
Date: 2021-10-25 16:59:44
Also in:
kvmarm, lkml, stable
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
From: Quentin Perret <redacted> [ Upstream commit 7615c2a514788559c6684234b8fc27f3a843c2c6 ] Some of the refcount manipulation helpers used at EL2 are instrumented to catch a corrupted state, but not all of them are treated equally. Let's make things more consistent by instrumenting hyp_page_ref_dec_and_test() as well. Acked-by: Will Deacon <will@kernel.org> Suggested-by: Will Deacon <will@kernel.org> Signed-off-by: Quentin Perret <redacted> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20211005090155.734578-6-qperret@google.com (local) Signed-off-by: Sasha Levin <sashal@kernel.org> --- arch/arm64/kvm/hyp/nvhe/page_alloc.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/arm64/kvm/hyp/nvhe/page_alloc.c b/arch/arm64/kvm/hyp/nvhe/page_alloc.c
index 41fc25bdfb34..da2d3c0bfb7f 100644
--- a/arch/arm64/kvm/hyp/nvhe/page_alloc.c
+++ b/arch/arm64/kvm/hyp/nvhe/page_alloc.c@@ -152,6 +152,7 @@ static inline void hyp_page_ref_inc(struct hyp_page *p) static inline int hyp_page_ref_dec_and_test(struct hyp_page *p) { + BUG_ON(!p->refcount); p->refcount--; return (p->refcount == 0); }
--
2.33.0
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