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 cd58c123f547e79e046bdf34909602efdff5ab59..b55dff1aa50b3b6d8a88ec87b696dd252333604e 100644 (file)
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -2996,7 +2996,7 @@ 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);