[PATCH] ia64: prevent buffer-overrun in acpi_numa_memory_affinity_init()

The code in acpi_numa_memory_affinity_init that sorts the node_memblk
can overrun the array & clobber the memory that follows the end of the
array. The error will be seen only on systems that fill the
node_memblk array and only if SAL doesnt sort the entries in the SRAT.

arch/ia64/kernel/acpi.c

@@ -413,7 +413,7 @@ acpi_numa_memory_affinity_init (struct acpi_table_memory_affinity *ma)
 			break;
 	}
 	if (p < pend) {
-		for (q = pend; q >= p; q--)
+		for (q = pend - 1; q >= p; q--)
 			*(q + 1) = *q;
 	}
 	p->start_paddr = paddr;