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ocfs2: Fix memory overflow in cow_by_page.

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In ocfs2_duplicate_clusters_by_page, we calculate map_end
by shifting page_index. But actually in case we meet with
a large offset(say in a i686 box, poff_t is only 32 bits
and page_index=2056240), we will overflow. So change the
type of page_index to loff_t.

Signed-off-by: Tao Ma <tao.ma@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
This commit is contained in:
Tao Ma 2010-01-30 23:32:19 +08:00 committed by Joel Becker
parent 26636bf6b2
commit d622b89a2f
1 changed files with 2 additions and 2 deletions
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4
fs/ocfs2/refcounttree.c
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@ -2945,7 +2945,7 @@ static int ocfs2_duplicate_clusters_by_page(handle_t *handle,
while (offset < end) {
page_index = offset >> PAGE_CACHE_SHIFT;
map_end = (page_index + 1) << PAGE_CACHE_SHIFT;
map_end = ((loff_t)page_index + 1) << PAGE_CACHE_SHIFT;
if (map_end > end)
map_end = end;
@ -3170,7 +3170,7 @@ static int ocfs2_cow_sync_writeback(struct super_block *sb,
while (offset < end) {
page_index = offset >> PAGE_CACHE_SHIFT;
map_end = (page_index + 1) << PAGE_CACHE_SHIFT;
map_end = ((loff_t)page_index + 1) << PAGE_CACHE_SHIFT;
if (map_end > end)
map_end = end;