linux-kernel - [PATCH v5 2/2] irqchip/gic-v3-its: remove BUG_ON in its_vpe_irq_domain

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20240418061053.96803-3-guanrui.huang@linux.alibaba.com>
Date: Thu, 18 Apr 2024 14:10:53 +0800
From: Guanrui Huang <guanrui.huang@...ux.alibaba.com>
To: maz@...nel.org
Cc: Markus.Elfring@....de,
	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 v5 2/2] irqchip/gic-v3-its: remove BUG_ON in its_vpe_irq_domain_alloc

This BUG_ON() is useless, because the same effect will be obtained 
by letting the code run its course and vm being dereferenced,
triggering an exception.

So just remove this check.

Acked-by: Marc Zyngier <maz@...nel.org>
Signed-off-by: Guanrui Huang <guanrui.huang@...ux.alibaba.com>
---
 drivers/irqchip/irq-gic-v3-its.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 2305f6b524a9..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;
-- 
2.36.1