-stable review patch. If anyone has any objections, please let us know.
------------------
From: Neil Brown <[email protected]>
If 'num_pages' were ever 1 more than a multiple of 8 (32bit platforms)
for 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 <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/md/bitmap.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -863,9 +863,7 @@ static int bitmap_init_from_disk(struct
/* 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;
--
-
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