linux-kernel - [tip: irq/urgent] irqchip/gic-v3-its: Prevent double free on error

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Message-ID: <171404920906.10875.16509237626955836035.tip-bot2@tip-bot2>
Date: Thu, 25 Apr 2024 12:46:49 -0000
From: "tip-bot2 for Guanrui Huang" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Guanrui Huang <guanrui.huang@...ux.alibaba.com>,
 Thomas Gleixner <tglx@...utronix.de>, Marc Zyngier <maz@...nel.org>,
 Zenghui Yu <yuzenghui@...wei.com>, stable@...r.kernel.org, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: irq/urgent] irqchip/gic-v3-its: Prevent double free on error

The following commit has been merged into the irq/urgent branch of tip:

Commit-ID:     c26591afd33adce296c022e3480dea4282b7ef91
Gitweb:        https://git.kernel.org/tip/c26591afd33adce296c022e3480dea4282b7ef91
Author:        Guanrui Huang <guanrui.huang@...ux.alibaba.com>
AuthorDate:    Thu, 18 Apr 2024 14:10:52 +08:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Thu, 25 Apr 2024 14:30:46 +02:00

irqchip/gic-v3-its: Prevent double free on error

The error handling path in its_vpe_irq_domain_alloc() causes a double free
when its_vpe_init() fails after successfully allocating at least one
interrupt. This happens because its_vpe_irq_domain_free() frees the
interrupts along with the area bitmap and the vprop_page and
its_vpe_irq_domain_alloc() subsequently frees the area bitmap and the
vprop_page again.

Fix this by unconditionally invoking its_vpe_irq_domain_free() which
handles all cases correctly and by removing the bitmap/vprop_page freeing
from its_vpe_irq_domain_alloc().

[ tglx: Massaged change log ]

Fixes: 7d75bbb4bc1a ("irqchip/gic-v3-its: Add VPE irq domain allocation/teardown")
Signed-off-by: Guanrui Huang <guanrui.huang@...ux.alibaba.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Marc Zyngier <maz@...nel.org>
Reviewed-by: Zenghui Yu <yuzenghui@...wei.com>
Cc: stable@...r.kernel.org
Link: https://lore.kernel.org/r/20240418061053.96803-2-guanrui.huang@linux.alibaba.com
---
 drivers/irqchip/irq-gic-v3-its.c |  9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 2a537cb..5f7d3db 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -4567,13 +4567,8 @@ 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;
 }