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-rw-r--r--arch/powerpc/kernel/paca.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c
index d6e195e8cd4c..5a23b69f8129 100644
--- a/arch/powerpc/kernel/paca.c
+++ b/arch/powerpc/kernel/paca.c
@@ -115,6 +115,14 @@ static struct slb_shadow * __init init_slb_shadow(int cpu)
{
struct slb_shadow *s = &slb_shadow[cpu];
+ /*
+ * When we come through here to initialise boot_paca, the slb_shadow
+ * buffers are not allocated yet. That's OK, we'll get one later in
+ * boot, but make sure we don't corrupt memory at 0.
+ */
+ if (!slb_shadow)
+ return NULL;
+
s->persistent = cpu_to_be32(SLB_NUM_BOLTED);
s->buffer_length = cpu_to_be32(sizeof(*s));