This is a note to let you know that I've just added the patch titled
ubifs: Rectify space budget for ubifs_xrename()
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ubifs-rectify-space-budget-for-ubifs_xrename.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 83c45ff96302da88b89a205d212f5a93df82d20b
Author: Zhihao Cheng <chengzhihao1@xxxxxxxxxx>
Date: Tue Oct 11 11:47:28 2022 +0800
ubifs: Rectify space budget for ubifs_xrename()
[ Upstream commit 1b2ba09060e41adb356b9ae58ef94a7390928004 ]
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: 9ec64962afb170 ("ubifs: Implement RENAME_EXCHANGE")
Signed-off-by: Zhihao Cheng <chengzhihao1@xxxxxxxxxx>
Signed-off-by: Richard Weinberger <richard@xxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
index 0c012f8fabbb2..9a4f9563aceea 100644
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -1538,6 +1538,10 @@ 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);
@@ -1563,6 +1567,7 @@ 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;
