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ubifs: Rectify space budget for ubifs_xrename() 

There is no space budget for ubifs_xrename(). It may let
make_reservation() return with -ENOSPC, which could turn
ubifs to read-only mode in do_writepage() process.
Fix it by adding space budget for ubifs_xrename().

Fetch a reproducer in [Link].

Link: https://bugzilla.kernel.org/show_bug.cgi?id=216569
Fixes: 9ec64962af ("ubifs: Implement RENAME_EXCHANGE")
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Zhihao Cheng 2022-10-11 11:47:28 +08:00 committed by Richard Weinberger
parent c2c36cc6ca
commit 1b2ba09060
1 changed files with 5 additions and 0 deletions
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5
fs/ubifs/dir.c
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@ -1576,6 +1576,10 @@ static int ubifs_xrename(struct inode *old_dir, struct dentry *old_dentry,
return err;
}
err = ubifs_budget_space(c, &req);
if (err)
goto out;
lock_4_inodes(old_dir, new_dir, NULL, NULL);
time = current_time(old_dir);
@ -1601,6 +1605,7 @@ static int ubifs_xrename(struct inode *old_dir, struct dentry *old_dentry,
unlock_4_inodes(old_dir, new_dir, NULL, NULL);
ubifs_release_budget(c, &req);
out:
fscrypt_free_filename(&fst_nm);
fscrypt_free_filename(&snd_nm);
return err;