tree 0a0cf8522db1e617ef6cf9379ae9b5fd89e8a3bd
parent 100136acfb4023ab7dc899192e95aca9aedfe98a
author Chao Yu <chao2.yu@samsung.com> 1441953832 +0800
committer Jaegeuk Kim <jaegeuk@kernel.org> 1444432850 -0700

f2fs: fix overflow of size calculation

We have potential overflow issue when calculating size of object, when
we left shift index with PAGE_CACHE_SHIFT bits, if type of index has only
32-bits space in 32-bit architecture, left shifting will incur overflow,
i.e:

pgoff_t index =  0xFFFFFFFF;
loff_t size = index << PAGE_CACHE_SHIFT;
size: 0xFFFFF000

So we should cast index with 64-bits type to avoid this issue.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>