diff options
| author | Laura Abbott <lauraa@codeaurora.org> | 2014-07-07 17:45:43 -0700 |
|---|---|---|
| committer | Grant Likely <grant.likely@linaro.org> | 2014-08-01 12:22:20 -0600 |
| commit | 3069f0c07f8d64ebf6ff5d2d1553e0a6dad4316e (patch) | |
| tree | 79cdf807a67f1f710075eb8b99adf1ee18a83084 /drivers | |
| parent | ae9304c9d3111759fed5946272be3b13ba41f7e3 (diff) | |
| download | linux-3069f0c07f8d64ebf6ff5d2d1553e0a6dad4316e.tar.bz2 | |
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 <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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/of/fdt.c | 22 |
1 files changed, 11 insertions, 11 deletions
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index b777d8f46bd5..b88a68eee86b 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) { |