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| author | Jaegeuk Kim <jaegeuk.kim@samsung.com> | 2014-04-02 09:04:42 +0900 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk.kim@samsung.com> | 2014-04-02 09:56:27 +0900 |
| commit | ce23447fe5764391025a67c20c97eaf5c6ac1ec3 (patch) | |
| tree | 52efc6a6f4a78ed52514b50e0b72c93fc07864b5 /fs/f2fs/segment.c | |
| parent | d54c795b495b9bd417e482286c832c9a8eb210ae (diff) | |
| download | linux-ce23447fe5764391025a67c20c97eaf5c6ac1ec3.tar.gz linux-ce23447fe5764391025a67c20c97eaf5c6ac1ec3.tar.bz2 linux-ce23447fe5764391025a67c20c97eaf5c6ac1ec3.zip | |
f2fs: fix to cover io->bio with io_rwsem
In the f2fs_wait_on_page_writeback, io->bio should be covered by io_rwsem.
Otherwise, the bio pointer can become a dangling pointer due to data races.
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Diffstat (limited to 'fs/f2fs/segment.c')
| -rw-r--r-- | fs/f2fs/segment.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index cb49e6390ffa..f799c6a34c39 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -1049,15 +1049,14 @@ static inline bool is_merged_page(struct f2fs_sb_info *sbi, { enum page_type btype = PAGE_TYPE_OF_BIO(type); struct f2fs_bio_info *io = &sbi->write_io[btype]; - struct bio *bio = io->bio; struct bio_vec *bvec; int i; down_read(&io->io_rwsem); - if (!bio) + if (!io->bio) goto out; - bio_for_each_segment_all(bvec, bio, i) { + bio_for_each_segment_all(bvec, io->bio, i) { if (page == bvec->bv_page) { up_read(&io->io_rwsem); return true; |