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f2fs: fix potential corruption when moving a directory 

F2FS has the same issue in ext4_rename causing crash revealed by
xfstests/generic/707.

See also commit 0813299c58 ("ext4: Fix possible corruption when moving a directory")

CC: stable@vger.kernel.org
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2023-04-06 11:18:48 -07:00
parent d09bd85300
commit d94772154e
1 changed files with 15 additions and 1 deletions
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16
fs/f2fs/namei.c
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@ -995,12 +995,20 @@ static int f2fs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
goto out;
}
/*
* Copied from ext4_rename: we need to protect against old.inode
* directory getting converted from inline directory format into
* a normal one.
*/
if (S_ISDIR(old_inode->i_mode))
inode_lock_nested(old_inode, I_MUTEX_NONDIR2);
err = -ENOENT;
old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
if (!old_entry) {
if (IS_ERR(old_page))
err = PTR_ERR(old_page);
goto out;
goto out_unlock_old;
}
if (S_ISDIR(old_inode->i_mode)) {
@ -1108,6 +1116,9 @@ static int f2fs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
f2fs_unlock_op(sbi);
if (S_ISDIR(old_inode->i_mode))
inode_unlock(old_inode);
if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
f2fs_sync_fs(sbi->sb, 1);
@ -1122,6 +1133,9 @@ out_dir:
f2fs_put_page(old_dir_page, 0);
out_old:
f2fs_put_page(old_page, 0);
out_unlock_old:
if (S_ISDIR(old_inode->i_mode))
inode_unlock(old_inode);
out:
iput(whiteout);
return err;