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Devicetree bugfixe for v3.16 

Important bug fix for parsing 64-bit addresses on 32-bit platforms.
 Without this patch the kernel will try to use memory ranges that cannot
 be reached.
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Merge tag 'dt-for-linus' of git://git.secretlab.ca/git/linux

Pull devicetree bugfix from Grant Likely:
 "Important bug fix for parsing 64-bit addresses on 32-bit platforms.
  Without this patch the kernel will try to use memory ranges that
  cannot be reached"

* tag 'dt-for-linus' of git://git.secretlab.ca/git/linux:
  of: Check for phys_addr_t overflows in early_init_dt_add_memory_arch
This commit is contained in:
Linus Torvalds 2014-07-06 12:11:57 -07:00
parent 8addf0c713 a67a6ed155
commit 100193f5b7
1 changed files with 15 additions and 0 deletions
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15
drivers/of/fdt.c
View File

@ -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);