[PATCH 5.17 061/343] kvm: selftests: aarch64: fix assert in gicv3_access_reg

[Greg Kroah-Hartman]

From: Ricardo Koller <ricarkol@xxxxxxxxxx>

[ Upstream commit cc94d47ce16d4147d546e47c8248e8bd12ba5fe5 ]

The val argument in gicv3_access_reg can have any value when used for a
read, not necessarily 0.  Fix the assert by checking val only for
writes.

Signed-off-by: Ricardo Koller <ricarkol@xxxxxxxxxx>
Reported-by: Reiji Watanabe <reijiw@xxxxxxxxxx>
Cc: Andrew Jones <drjones@xxxxxxxxxx>
Reviewed-by: Andrew Jones <drjones@xxxxxxxxxx>
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220127030858.3269036-2-ricarkol@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 tools/testing/selftests/kvm/lib/aarch64/gic_v3.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kvm/lib/aarch64/gic_v3.c b/tools/testing/selftests/kvm/lib/aarch64/gic_v3.c
index 00f613c0583c..e4945fe66620 100644
--- a/tools/testing/selftests/kvm/lib/aarch64/gic_v3.c
+++ b/tools/testing/selftests/kvm/lib/aarch64/gic_v3.c
@@ -159,7 +159,7 @@ static void gicv3_access_reg(uint32_t intid, uint64_t offset,
 	uint32_t cpu_or_dist;
 
 	GUEST_ASSERT(bits_per_field <= reg_bits);
-	GUEST_ASSERT(*val < (1U << bits_per_field));
+	GUEST_ASSERT(!write || *val < (1U << bits_per_field));
 	/* Some registers like IROUTER are 64 bit long. Those are currently not
 	 * supported by readl nor writel, so just asserting here until then.
 	 */
-- 
2.35.1