x86/irq: Validate that irq descriptor is still active
authorThomas Gleixner <tglx@linutronix.de>
Thu, 31 Dec 2015 16:30:45 +0000 (16:30 +0000)
committerThomas Gleixner <tglx@linutronix.de>
Fri, 15 Jan 2016 12:43:59 +0000 (13:43 +0100)
commit36f34c8c63da3e272fd66f91089228c22d2b6e8b
tree7797528912186ea732fb2679482472f1a90f2b35
parent111abeba67e0dbdc26537429de9155e4f1d807d8
x86/irq: Validate that irq descriptor is still active

In fixup_irqs() we unconditionally dereference the irq chip of an irq
descriptor. The descriptor might still be valid, but already cleaned up,
i.e. the chip removed. Add a check for this condition.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Joe Lawrence <joe.lawrence@stratus.com>
Cc: Jeremiah Mahler <jmmahler@gmail.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: andy.shevchenko@gmail.com
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: stable@vger.kernel.org #4.3+
Link: http://lkml.kernel.org/r/20151231160106.236423282@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
arch/x86/kernel/irq.c