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| author | Guenter Roeck <linux@roeck-us.net> | 2020-08-11 11:00:12 -0700 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-08-13 09:35:59 +0200 |
| commit | f107cee94ba4d2c7357fde59a1d84346c73d4958 (patch) | |
| tree | 5c0436dee6ead0a6cb7b107625ef2ed673291149 | |
| parent | e27b1636e9337d1a1d174b191e53d0f86421a822 (diff) | |
| download | linux-f107cee94ba4d2c7357fde59a1d84346c73d4958.tar.gz linux-f107cee94ba4d2c7357fde59a1d84346c73d4958.tar.bz2 linux-f107cee94ba4d2c7357fde59a1d84346c73d4958.zip | |
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@roeck-us.net>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20200811180012.80269-1-linux@roeck-us.net
| -rw-r--r-- | kernel/irq/manage.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index d55ba625d426..52ac5391dcc6 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; } |