The common early_init_dt_add_memory_arch takes the base and size of a memory region as u64 types. The function never checks if the base and size can actually fit in a phys_addr_t which may be smaller than 64-bits. This may result in incorrect memory being passed to memblock_add if the memory falls outside the range of phys_addr_t. Add range checks for the base and size if phys_addr_t is smaller than u64. Reported-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> Tested-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> Signed-off-by: Laura Abbott <lauraa@xxxxxxxxxxxxxx> --- v2: Switched to sizeof(phys_addr_t) < sizeof(u64) instead of macros. Sending to right e-mails/mailing lists this time. drivers/of/fdt.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index c4cddf0..b777d8f 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -880,6 +880,21 @@ void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size) const u64 phys_offset = __pa(PAGE_OFFSET); base &= PAGE_MASK; size &= PAGE_MASK; + + if (sizeof(phys_addr_t) < sizeof(u64)) { + if (base > ULONG_MAX) { + pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", + base, base + size); + return; + } + + if (base + size > ULONG_MAX) { + pr_warning("Ignoring memory range 0x%lx - 0x%llx\n", + ULONG_MAX, base + size); + size = ULONG_MAX - base; + } + } + if (base + size < phys_offset) { pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", base, base + size); -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, hosted by The Linux Foundation -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html