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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2014-10-29 19:09:32 +0300
committerGrant Likely <grant.likely@linaro.org>2014-11-04 19:43:10 +0300
commit8cccffc52694938fc88f3d90bc7fed8460e27191 (patch)
tree76ea435917e5cfd97859a813103a3aaa52ae5124 /drivers/of
parent50ba08f301a1b0310775deeed00c9b24ba75fe8a (diff)
downloadlinux-8cccffc52694938fc88f3d90bc7fed8460e27191.tar.xz
of: check for size < 0 after rounding in early_init_dt_add_memory_arch
Memory regions passed to early_init_dt_add_memory_arch() are rounded to PAGE_SIZE by subtracting the size of the leading fractional page from the 'size' argument. However, size being a u64 type, if its value is sufficiently small, the subtraction wraps around and produces a bogus value, potentially leading to crashes. Fix this by ignoring the memory range in such cases. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Grant Likely <grant.likely@linaro.org>
Diffstat (limited to 'drivers/of')
-rw-r--r--drivers/of/fdt.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 535124670257..83a8e1154602 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -928,6 +928,11 @@ void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size)
const u64 phys_offset = __pa(PAGE_OFFSET);
if (!PAGE_ALIGNED(base)) {
+ if (size < PAGE_SIZE - (base & ~PAGE_MASK)) {
+ pr_warn("Ignoring memory block 0x%llx - 0x%llx\n",
+ base, base + size);
+ return;
+ }
size -= PAGE_SIZE - (base & ~PAGE_MASK);
base = PAGE_ALIGN(base);
}