linux-kernel - [tip: irq/urgent] genirq: Unlock irq descriptor after errors

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Message-ID: <159730453302.3192.18071918978987971140.tip-bot2@tip-bot2>
Date:   Thu, 13 Aug 2020 07:42:13 -0000
From:   "tip-bot2 for Guenter Roeck" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Thomas Gleixner <tglx@...utronix.de>, stable@...r.kernel.org,
        x86 <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [tip: irq/urgent] genirq: Unlock irq descriptor after errors

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

Commit-ID:     f107cee94ba4d2c7357fde59a1d84346c73d4958
Gitweb:        https://git.kernel.org/tip/f107cee94ba4d2c7357fde59a1d84346c73d4958
Author:        Guenter Roeck <linux@...ck-us.net>
AuthorDate:    Tue, 11 Aug 2020 11:00:12 -07:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Thu, 13 Aug 2020 09:35:59 +02:00

genirq: Unlock irq descriptor after errors

In irq_set_irqchip_state(), the irq descriptor is not unlocked after an
error is encountered. While that should never happen in practice, a buggy
driver may trigger it. This would result in a lockup, so fix it.

Fixes: 1d0326f352bb ("genirq: Check irq_data_get_irq_chip() return value before use")
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: stable@...r.kernel.org
Link: https://lore.kernel.org/r/20200811180012.80269-1-linux@roeck-us.net

---
 kernel/irq/manage.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index d55ba62..52ac539 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -2731,8 +2731,10 @@ int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
 
 	do {
 		chip = irq_data_get_irq_chip(data);
-		if (WARN_ON_ONCE(!chip))
-			return -ENODEV;
+		if (WARN_ON_ONCE(!chip)) {
+			err = -ENODEV;
+			goto out_unlock;
+		}
 		if (chip->irq_set_irqchip_state)
 			break;
 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
@@ -2745,6 +2747,7 @@ int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
 	if (data)
 		err = chip->irq_set_irqchip_state(data, which, val);
 
+out_unlock:
 	irq_put_desc_busunlock(desc, flags);
 	return err;
 }