f2fs: avoid data offset overflow when lseeking huge file

xfstest generic/285 complains our issue in lseeking huge file.

Here is the detail output of generic/285:
"./check -f2fs tests/generic/285
Ran: generic/285
Failures: generic/285
Failed 1 of 1 tests

10. Test a huge file for offset overflow
10.01 SEEK_HOLE expected 65536 or 8589934592, got 65536.          succ
10.02 SEEK_HOLE expected 65536 or 8589934592, got 65536.          succ
10.03 SEEK_DATA expected 0 or 0, got 0.                           succ
10.04 SEEK_DATA expected 1 or 1, got 1.                           succ
10.05 SEEK_HOLE expected 8589934592 or 8589934592, got 0.         FAIL
10.06 SEEK_DATA expected 8589869056 or 8589869056, got 8589869056. succ
10.07 SEEK_DATA expected 8589869057 or 8589869057, got 8589869057. succ
10.08 SEEK_DATA expected 8589869056 or 8589869056, got 4294901760. FAIL"

The reason of this issue is:
We will calculate current offset through left shifting page-offset with
PAGE_CACHE_SHIFT bits, but our page-offset is a type of unsigned long, its size
is 4 bytes in 32-bits machine.

So if our page-offset is bigger than (1 << 32 / pagesize - 1), result of left
shifting will overflow.

Let's fix this issue by casting type of page-offset to type of current offset:
loff_t.

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

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index ec17d05d6553e0753e8197f814d8c3d3bbc56a5a..7188a2ac64b573d11ea11128a2c1692a1c1a0285 100644 (file)
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -357,7 +357,7 @@ static loff_t f2fs_seek_block(struct file *file, loff_t offset, int whence)
                /* find data/hole in dnode block */
                for (; dn.ofs_in_node < end_offset;
                                dn.ofs_in_node++, pgofs++,
-                               data_ofs = pgofs << PAGE_CACHE_SHIFT) {
+                               data_ofs = (loff_t)pgofs << PAGE_CACHE_SHIFT) {
                        block_t blkaddr;
                        blkaddr = datablock_addr(dn.node_page, dn.ofs_in_node);