diff options
| author | Chao Yu <chao2.yu@samsung.com> | 2014-08-30 01:52:34 (GMT) |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2014-09-02 07:22:24 (GMT) |
| commit | b73e52824c8920a5ff754e3c8ff68466a7dd61f9 (patch) | |
| tree | 9f3d869cb4e7cb96b6992da333e9daec987ca86b /fs/f2fs/gc.c | |
| parent | 3304b56401c4509ffaa74705b49edc9e13cee195 (diff) | |
| download | linux-b73e52824c8920a5ff754e3c8ff68466a7dd61f9.tar.xz | |
f2fs: reposition unlock_new_inode to prevent accessing invalid inode
As the race condition on the inode cache, following scenario can appear:
[Thread a] [Thread b]
->f2fs_mkdir
->f2fs_add_link
->__f2fs_add_link
->init_inode_metadata failed here
->gc_thread_func
->f2fs_gc
->do_garbage_collect
->gc_data_segment
->f2fs_iget
->iget_locked
->wait_on_inode
->unlock_new_inode
->move_data_page
->make_bad_inode
->iput
When we fail in create/symlink/mkdir/mknod/tmpfile, the new allocated inode
should be set as bad to avoid being accessed by other thread. But in above
scenario, it allows f2fs to access the invalid inode before this inode was set
as bad.
This patch fix the potential problem, and this issue was found by code review.
change log from v1:
o Add condition judgment in gc_data_segment() suggested by Changman Lee.
o use iget_failed to simplify code.
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/gc.c')
| -rw-r--r-- | fs/f2fs/gc.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c index e8507b1..943a31d 100644 --- a/fs/f2fs/gc.c +++ b/fs/f2fs/gc.c @@ -593,7 +593,7 @@ next_step: if (phase == 2) { inode = f2fs_iget(sb, dni.ino); - if (IS_ERR(inode)) + if (IS_ERR(inode) || is_bad_inode(inode)) continue; start_bidx = start_bidx_of_node(nofs, F2FS_I(inode)); |