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Subject[tip:x86/urgent] x86: Fix NULL pointer access in irq_force_complete_move() for Xen guests
Commit-ID:  bbd391a15d82e14efe9d69ba64cadb855b061dba
Gitweb: http://git.kernel.org/tip/bbd391a15d82e14efe9d69ba64cadb855b061dba
Author: Prarit Bhargava <prarit@redhat.com>
AuthorDate: Tue, 27 Apr 2010 11:24:42 -0400
Committer: H. Peter Anvin <hpa@zytor.com>
CommitDate: Fri, 30 Apr 2010 14:31:38 -0700

x86: Fix NULL pointer access in irq_force_complete_move() for Xen guests

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 <prarit@redhat.com>
LKML-Reference: <20100427152434.16193.49104.sendpatchset@prarit.bos.redhat.com>
Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: <stable@kernel.org> [2.6.33]
---
arch/x86/kernel/apic/io_apic.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 127b871..eb2789c 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2545,6 +2545,9 @@ 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

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