On Fri, Jun 15, 2012 at 2:09 PM, Greg Pearson <greg.pearson@xxxxxx> wrote:
> The __alloc_memory_core_early() routine will ask memblock for a range
> of memory then try to reserve it. If the reserved region array lacks
> space for the new range, memblock_double_array() is called to allocate
> more space for the array. If memblock is used to allocate memory for
> the new array it can end up using a range that overlaps with the range
> originally allocated in __alloc_memory_core_early(), leading to possible
> data corruption.
>
> @@ -399,7 +401,8 @@ repeat:
> */
> if (!insert) {
> while (type->cnt + nr_new > type->max)
> - if (memblock_double_array(type) < 0)
> + /* Avoid possible overlap if range is being reserved */
> + if (memblock_double_array(type, base) < 0)
should use obase here.
Yinghai
> return -ENOMEM;
> insert = true;
> goto repeat;
--
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