powerpc/crashdump: Do not fail on NULL pointer dereferencing

commit 426b6cb478e60352a463a0d1ec75c1c9fab30b13 upstream.

Signed-off-by: Maxim Uvarov <muvarov@gmail.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Kamalesh babulal <kamalesh@linux.vnet.ibm.com>
cc: Anton Blanchard <anton@samba.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/arch/powerpc/kernel/crash.c b/arch/powerpc/kernel/crash.c
index f4a0188c4d368939cfb5103f1d93f145e403e3ed..b779818017871bef7eb56789e6bbc9f32814d1d5 100644 (file)
--- a/arch/powerpc/kernel/crash.c
+++ b/arch/powerpc/kernel/crash.c
@@ -377,6 +377,9 @@ void default_machine_crash_shutdown(struct pt_regs *regs)
        for_each_irq(i) {
                struct irq_desc *desc = irq_desc + i;
 
+               if (!desc || !desc->chip || !desc->chip->eoi)
+                       continue;
+
                if (desc->status & IRQ_INPROGRESS)
                        desc->chip->eoi(i);