From: Andrey Ryabinin <a.ryabinin@samsung.com>
Date: Tue, 10 Feb 2015 22:11:33 +0000 (-0800)
Subject: mm, hugetlb: remove unnecessary lower bound on sysctl handlers"?
X-Git-Tag: fixes-v4.0-rc1~155^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3cd7645de624939c38f5124b4ac15f8b35a1a8b7;p=pandora-kernel.git

mm, hugetlb: remove unnecessary lower bound on sysctl handlers"?

Commit ed4d4902ebdd ("mm, hugetlb: remove hugetlb_zero and
hugetlb_infinity") replaced 'unsigned long hugetlb_zero' with 'int zero'
leading to out-of-bounds access in proc_doulongvec_minmax().  Use
'.extra1 = NULL' instead of '.extra1 = &zero'.  Passing NULL is
equivalent to passing minimal value, which is 0 for unsigned types.

Fixes: ed4d4902ebdd ("mm, hugetlb: remove hugetlb_zero and hugetlb_infinity")
Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com>
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Suggested-by: Manfred Spraul <manfred@colorfullife.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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