| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.13 019/110] genirq: Fix cpumask check in __irq_startup_managed() | Date | Tue, 3 Oct 2017 14:28:41 +0200 |
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4.13-stable review patch. If anyone has any objections, please let me know.
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From: Thomas Gleixner <tglx@linutronix.de>
commit 9cb067ef8a10bb13112e4d1c0ea996ec96527422 upstream.
The result of cpumask_any_and() is invalid when result greater or equal nr_cpu_ids. The current check is checking for greater only. Fix it.
Fixes: 761ea388e8c4 ("genirq: Handle managed irqs gracefully in irq_startup()") Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Juergen Gross <jgross@suse.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Chen Yu <yu.c.chen@intel.com> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Alok Kataria <akataria@vmware.com> Cc: Joerg Roedel <joro@8bytes.org> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Christoph Hellwig <hch@lst.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Rui Zhang <rui.zhang@intel.com> Cc: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Len Brown <lenb@kernel.org> Link: http://lkml.kernel.org/r/20170913213152.272283444@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- kernel/irq/chip.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -202,7 +202,7 @@ __irq_startup_managed(struct irq_desc *d irqd_clr_managed_shutdown(d); - if (cpumask_any_and(aff, cpu_online_mask) > nr_cpu_ids) { + if (cpumask_any_and(aff, cpu_online_mask) >= nr_cpu_ids) { /* * Catch code which fiddles with enable_irq() on a managed * and potentially shutdown IRQ. Chained interrupt
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