From 135ef954051b102870a8d47a8eb822af1f1b1ec1 Mon Sep 17 00:00:00 2001 From: Alexey Kardashevskiy Date: Wed, 19 Dec 2018 19:52:28 +1100 Subject: powerpc/powernv/npu: Check mmio_atsd array bounds when populating A broken device tree might contain more than 8 values and introduce hard to debug memory corruption bug. This adds the boundary check. Signed-off-by: Alexey Kardashevskiy Signed-off-by: Michael Ellerman --- arch/powerpc/platforms/powernv/npu-dma.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'arch') diff --git a/arch/powerpc/platforms/powernv/npu-dma.c b/arch/powerpc/platforms/powernv/npu-dma.c index 44f471959932..b713727663e2 100644 --- a/arch/powerpc/platforms/powernv/npu-dma.c +++ b/arch/powerpc/platforms/powernv/npu-dma.c @@ -1178,8 +1178,9 @@ int pnv_npu2_init(struct pci_controller *hose) npu->nmmu_flush = of_property_read_bool(hose->dn, "ibm,nmmu-flush"); - for (i = 0; !of_property_read_u64_index(hose->dn, "ibm,mmio-atsd", - i, &mmio_atsd); i++) + for (i = 0; i < ARRAY_SIZE(npu->mmio_atsd_regs) && + !of_property_read_u64_index(hose->dn, "ibm,mmio-atsd", + i, &mmio_atsd); i++) npu->mmio_atsd_regs[i] = ioremap(mmio_atsd, 32); pr_info("NPU%d: Found %d MMIO ATSD registers", hose->global_number, i); -- cgit v1.2.3