[PATCH kernel v6 16/20] powerpc/powernv/npu: Check mmio_atsd array bounds when populating
From: Alexey Kardashevskiy <hidden>
Date: 2018-12-19 09:37:58
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
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 <redacted> --- arch/powerpc/platforms/powernv/npu-dma.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/platforms/powernv/npu-dma.c b/arch/powerpc/platforms/powernv/npu-dma.c
index 31dfc11..2c405a4 100644
--- a/arch/powerpc/platforms/powernv/npu-dma.c
+++ b/arch/powerpc/platforms/powernv/npu-dma.c@@ -1179,8 +1179,9 @@ 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);
--
2.17.1