From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Date: Wed, 29 Oct 2014 16:09:32 +0000 (+0100)
Subject: of: check for size < 0 after rounding in early_init_dt_add_memory_arch
X-Git-Tag: omap-for-v3.19/fixes-rc1~127^2~36
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8cccffc52694938fc88f3d90bc7fed8460e27191;p=pandora-kernel.git

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>
---

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