powerpc/fsl-booke: read buffer overflow

cam[tlbcam_index] is checked before tlbcam_index < ARRAY_SIZE(cam)

Signed-off-by: Roel Kluin <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Kumar Gala <[e-mail]>
Signed-off-by: Benjamin Herrenschmidt <[e-mail]>

arch/powerpc/mm/fsl_booke_mmu.c

···
 	unsigned long virt = PAGE_OFFSET;
 	phys_addr_t phys = memstart_addr;
 
-	while (cam[tlbcam_index] && tlbcam_index < ARRAY_SIZE(cam)) {
+	while (tlbcam_index < ARRAY_SIZE(cam) && cam[tlbcam_index]) {
 		settlbcam(tlbcam_index, virt, phys, cam[tlbcam_index], PAGE_KERNEL_X, 0);
 		virt += cam[tlbcam_index];
 		phys += cam[tlbcam_index];