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of: Use proper types for checking memory overflow 

Commit a67a6ed155
(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 <lauraa@codeaurora.org>
Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Grant Likely <grant.likely@linaro.org>
This commit is contained in:
Laura Abbott 2014-07-07 17:45:43 -07:00 committed by Grant Likely
parent ae9304c9d3
commit 3069f0c07f
1 changed files with 11 additions and 11 deletions
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22
drivers/of/fdt.c
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@ -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) {