linux-kernel - [PATCH v3] irqchip/gic-v3-its: Fix double free on error

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Message-Id: <20240412021556.101792-1-guanrui.huang@linux.alibaba.com>
Date: Fri, 12 Apr 2024 10:15:56 +0800
From: Guanrui Huang <guanrui.huang@...ux.alibaba.com>
To: maz@...nel.org
Cc: yuzenghui@...wei.com,
	shannon.zhao@...ux.alibaba.com,
	tglx@...utronix.de,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Guanrui Huang <guanrui.huang@...ux.alibaba.com>
Subject: [PATCH v3] irqchip/gic-v3-its: Fix double free on error

In its_vpe_irq_domain_alloc, when its_vpe_init() returns an error
with i > 0, its_vpe_irq_domain_free may free bitmap and vprop_page,
and then there is a double free in its_vpe_irq_domain_alloc.

Fix it by calling its_vpe_irq_domain_free directly, bitmap and
vprop_page will be freed in this function.

Signed-off-by: Guanrui Huang <guanrui.huang@...ux.alibaba.com>
---
 drivers/irqchip/irq-gic-v3-its.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index fca888b36680..55c83e19719d 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -4521,8 +4521,6 @@ static int its_vpe_irq_domain_alloc(struct irq_domain *domain, unsigned int virq
 	struct page *vprop_page;
 	int base, nr_ids, i, err = 0;
 
-	BUG_ON(!vm);
-
 	bitmap = its_lpi_alloc(roundup_pow_of_two(nr_irqs), &base, &nr_ids);
 	if (!bitmap)
 		return -ENOMEM;
@@ -4561,13 +4559,8 @@ static int its_vpe_irq_domain_alloc(struct irq_domain *domain, unsigned int virq
 		irqd_set_resend_when_in_progress(irq_get_irq_data(virq + i));
 	}
 
-	if (err) {
-		if (i > 0)
-			its_vpe_irq_domain_free(domain, virq, i);
-
-		its_lpi_free(bitmap, base, nr_ids);
-		its_free_prop_table(vprop_page);
-	}
+	if (err)
+		its_vpe_irq_domain_free(domain, virq, i);
 
 	return err;
 }
-- 
2.36.1