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mm/memblock.c: fix memblock_next_valid_pfn()

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Obviously, we should not access memblock.memory.regions[right] if
'right' is outside of [0..memblock.memory.cnt>.

Fixes: b92df1de5d ("mm: page_alloc: skip over regions of invalid pfns where possible")
Link: http://lkml.kernel.org/r/20170303023745.9104-1-takahiro.akashi@linaro.org
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: Paul Burton <paul.burton@imgtec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
AKASHI Takahiro 2017-03-09 16:17:17 -08:00 committed by Linus Torvalds
parent 46aa6a302b
commit c9a1b80dae
1 changed files with 4 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

3
mm/memblock.c
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@ -1118,6 +1118,9 @@ unsigned long __init_memblock memblock_next_valid_pfn(unsigned long pfn,
} }
} while (left < right); } while (left < right);
if (right == type->cnt)
return max_pfn;
else
return min(PHYS_PFN(type->regions[right].base), max_pfn); return min(PHYS_PFN(type->regions[right].base), max_pfn);
} }