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mm/sparse.c: fix ALIGN() without power of 2 in sparse_buffer_alloc()

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The size argument passed into sparse_buffer_alloc() has already been
aligned with PAGE_SIZE or PMD_SIZE.

If the size after aligned is not power of 2 (e.g.  0x480000), the
PTR_ALIGN() will return wrong value.  Use roundup to round sparsemap_buf
up to next multiple of size.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Lecopzer Chen <[email protected]>
Signed-off-by: Mark-PK Tsai <[email protected]>
Cc: YJ Chiang <[email protected]>
Cc: Lecopzer Chen <[email protected]>
Cc: Pavel Tatashin <[email protected]>
Cc: Oscar Salvador <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Mike Rapoport <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Lecopzer Chen 2019-09-23 15:36:24 -07:00 • committed by Linus Torvalds
commit db57e98d87
1 changed files with 1 additions and 1 deletions
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2
mm/sparse.c
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@ -501,7 +501,7 @@ void * __meminit sparse_buffer_alloc(unsigned long size)
void *ptr = NULL;
if (sparsemap_buf) {
ptr = PTR_ALIGN(sparsemap_buf, size);
ptr = (void *) roundup((unsigned long)sparsemap_buf, size);
if (ptr + size > sparsemap_buf_end)
ptr = NULL;
else {