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| author | Chao Yu <chao2.yu@samsung.com> | 2015-02-09 11:23:58 +0800 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2015-02-11 17:04:46 -0800 |
| commit | 2e023174a88dd14eab30fae3a1f6c97f37eb3bb8 (patch) | |
| tree | b974fd6dc28d34efa48277514ff6db0e23fa9f29 /fs | |
| parent | 560d4672e2f9f15aee2a9de1f1e70ef4c50f95d8 (diff) | |
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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/f2fs/file.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index ec17d05d6553..7188a2ac64b5 100644 --- 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); |