tree 76ea435917e5cfd97859a813103a3aaa52ae5124
parent 50ba08f301a1b0310775deeed00c9b24ba75fe8a
author Ard Biesheuvel <ard.biesheuvel@linaro.org> 1414598972 +0100
committer Grant Likely <grant.likely@linaro.org> 1415119390 +0000

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>