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[PATCH] md: fix calculation for size of filemap_attr array in md/bitmap 

If 'num_pages' were ever 1 more than a multiple of 8 (32bit platforms)
or of 16 (64 bit platforms).  filemap_attr would be allocated one
'unsigned long' shorter than required.  We need a round-up in there.

Signed-off-by: Neil Brown <neilb@suse.de>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Neil Brown 2007-04-11 23:28:44 -07:00 committed by Linus Torvalds
parent b6550777a3
commit 505fa2c4a2
1 changed files with 1 additions and 3 deletions
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4
drivers/md/bitmap.c
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@ -863,9 +863,7 @@ static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start)
/* We need 4 bits per page, rounded up to a multiple of sizeof(unsigned long) */
bitmap->filemap_attr = kzalloc(
(((num_pages*4/8)+sizeof(unsigned long)-1)
/sizeof(unsigned long))
*sizeof(unsigned long),
roundup( DIV_ROUND_UP(num_pages*4, 8), sizeof(unsigned long)),
GFP_KERNEL);
if (!bitmap->filemap_attr)
goto out;