From 3069f0c07f8d64ebf6ff5d2d1553e0a6dad4316e Mon Sep 17 00:00:00 2001 From: Laura Abbott Date: Mon, 7 Jul 2014 17:45:43 -0700 Subject: [PATCH] of: Use proper types for checking memory overflow Commit a67a6ed15513541579d38bcbd127e7be170710e5 (of: Check for phys_addr_t overflows in early_init_dt_add_memory_arch) corrected early_init_dt_add_memory_arch to account for overflows but did so in an unclean way using ULONG_MAX. There is no guarantee that sizeof(unsigned long) == sizeof(phys_addr_t). Check against phys_addr_t instead. Signed-off-by: Laura Abbott Tested-by: Geert Uytterhoeven Acked-by: Nicolas Pitre Signed-off-by: Grant Likely --- drivers/of/fdt.c | 22 +++++++++++----------- 1 file changed, 11 insertions(+), 11 deletions(-) diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index b777d8f..b88a68e 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -875,24 +875,24 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, } #ifdef CONFIG_HAVE_MEMBLOCK +#define MAX_PHYS_ADDR ((phys_addr_t)~0) + 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 > MAX_PHYS_ADDR) { + 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 > MAX_PHYS_ADDR) { + pr_warning("Ignoring memory range 0x%lx - 0x%llx\n", + ULONG_MAX, base + size); + size = MAX_PHYS_ADDR - base; } if (base + size < phys_offset) { -- 2.7.4