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[2/2] KVM: arm64: Report corrupted refcount at EL2

Message ID 20211005090155.734578-3-qperret@google.com (mailing list archive)
State New, archived
Headers show
Series A couple of EL2 refcounts fixes | expand

Commit Message

Quentin Perret Oct. 5, 2021, 9:01 a.m. UTC 
Some of the refcount manipulation helpers used at EL2 are instrumented
to catch a corrupt 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.

Suggested-by: Will Deacon <will@kernel.org>
Signed-off-by: Quentin Perret <qperret@google.com>
---
 arch/arm64/kvm/hyp/nvhe/page_alloc.c | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/arch/arm64/kvm/hyp/nvhe/page_alloc.c b/arch/arm64/kvm/hyp/nvhe/page_alloc.c
index a6e874e61a40..0bd7701ad1df 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);
 }