Re: [patch] mm: sparsemem memory_present() memory corruption fix

[Ingo Molnar]

small addendum to the changelog:

>                 if (!ms->section_mem_map)
>                         ms->section_mem_map = sparse_encode_early_nid(nid) |
+                                            | SECTION_MARKED_PRESENT
> 
> 'ms' will be out of bounds and we'll corrupt a small amount of memory by
> encoding the node ID. Depending on what that memory is, we might crash, 
> misbehave or just not notice the bug.

the corruption might happen when encoding a non-zero node ID, or due to 
the SECTION_MARKED_PRESENT which is 0x1:

mmzone.h:#define        SECTION_MARKED_PRESENT  (1UL<<0)

	Ingo
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