irqchip/gic-v3-its: Fix potential VPE leak on error

[ Upstream commit 280bef512933b2dda01d681d8cbe499b98fc5bdd ]

In its_vpe_irq_domain_alloc, when its_vpe_init() returns an error,
there is an off-by-one in the number of VPEs to be freed.

Fix it by simply passing the number of VPEs allocated, which is the
index of the loop iterating over the VPEs.

Fixes: 7d75bbb4bc1a ("irqchip/gic-v3-its: Add VPE irq domain allocation/teardown")
Signed-off-by: Kaige Fu <kaige.fu@linux.alibaba.com>
[maz: fixed commit message]
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/d9e36dee512e63670287ed9eff884a5d8d6d27f2.1631672311.git.kaige.fu@linux.alibaba.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 4069c215328b3e0eb0f34fbd6a4fab197b95cea6..95e0b82b6c661845651cb704e2b8701e1ec13990 100644 (file)
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -4489,7 +4489,7 @@ static int its_vpe_irq_domain_alloc(struct irq_domain *domain, unsigned int virq
 
        if (err) {
                if (i > 0)
-                       its_vpe_irq_domain_free(domain, virq, i - 1);
+                       its_vpe_irq_domain_free(domain, virq, i);
 
                its_lpi_free(bitmap, base, nr_ids);
                its_free_prop_table(vprop_page);