From d04fe16c31384a00562f7f9ca0cf78641a510ceb Mon Sep 17 00:00:00 2001 From: Prarit Bhargava Date: Tue, 27 Apr 2010 11:24:42 -0400 Subject: [PATCH] x86: Fix NULL pointer access in irq_force_complete_move() for Xen guests commit bbd391a15d82e14efe9d69ba64cadb855b061dba upstream. Upstream PV guests fail to boot because of a NULL pointer in irq_force_complete_move(). It is possible that xen guests have irq_desc->chip_data = NULL. Test for NULL chip_data pointer before attempting to complete an irq move. Signed-off-by: Prarit Bhargava LKML-Reference: <20100427152434.16193.49104.sendpatchset@prarit.bos.redhat.com> Acked-by: Suresh Siddha Signed-off-by: H. Peter Anvin Signed-off-by: Greg Kroah-Hartman --- arch/x86/kernel/apic/io_apic.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c index be370593aee8..b35c160a4c3b 100644 --- a/arch/x86/kernel/apic/io_apic.c +++ b/arch/x86/kernel/apic/io_apic.c @@ -2539,6 +2539,9 @@ void irq_force_complete_move(int irq) struct irq_desc *desc = irq_to_desc(irq); struct irq_cfg *cfg = desc->chip_data; + if (!cfg) + return; + __irq_complete_move(&desc, cfg->vector); } #else -- 2.39.5