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Date: Mon, 7 Jan 2013 13:23:41 -0800 From: Andrew Morton <akpm@...ux-foundation.org> To: Lin Feng <linfeng@...fujitsu.com> Cc: tj@...nel.org, mingo@...nel.org, yinghai@...nel.org, liwanp@...ux.vnet.ibm.com, benh@...nel.crashing.org, tangchen@...fujitsu.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH v2] mm: memblock: fix wrong memmove size in memblock_merge_regions() On Mon, 7 Jan 2013 11:41:36 +0800 Lin Feng <linfeng@...fujitsu.com> wrote: > The memmove span covers from (next+1) to the end of the array, and the index > of next is (i+1), so the index of (next+1) is (i+2). So the size of remaining > array elements is (type->cnt - (i + 2)). What are the user-visible effects of this bug? > --- a/mm/memblock.c > +++ b/mm/memblock.c > @@ -314,7 +314,8 @@ static void __init_memblock memblock_merge_regions(struct memblock_type *type) > } > > this->size += next->size; > - memmove(next, next + 1, (type->cnt - (i + 1)) * sizeof(*next)); > + /* move forward from next + 1, index of which is i + 2 */ > + memmove(next, next + 1, (type->cnt - (i + 2)) * sizeof(*next)); > type->cnt--; > } > } > -- > 1.7.11.7 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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