This is a note to let you know that I've just added the patch titled
ext4: refuse to create ea block when umounted
to the 4.19-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:
ext4-refuse-to-create-ea-block-when-umounted.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f31173c19901a96bb2ebf6bcfec8a08df7095c91 Mon Sep 17 00:00:00 2001
From: Jun Nie <jun.nie@xxxxxxxxxx>
Date: Tue, 3 Jan 2023 09:45:17 +0800
Subject: ext4: refuse to create ea block when umounted
From: Jun Nie <jun.nie@xxxxxxxxxx>
commit f31173c19901a96bb2ebf6bcfec8a08df7095c91 upstream.
The ea block expansion need to access s_root while it is
already set as NULL when umount is triggered. Refuse this
request to avoid panic.
Reported-by: syzbot+2dacb8f015bf1420155f@xxxxxxxxxxxxxxxxxxxxxxxxx
Link: https://syzkaller.appspot.com/bug?id=3613786cb88c93aa1c6a279b1df6a7b201347d08
Link: https://lore.kernel.org/r/20230103014517.495275-3-jun.nie@xxxxxxxxxx
Cc: stable@xxxxxxxxxx
Signed-off-by: Jun Nie <jun.nie@xxxxxxxxxx>
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ext4/xattr.c | 7 +++++++
1 file changed, 7 insertions(+)
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -1436,6 +1436,13 @@ static struct inode *ext4_xattr_inode_cr
uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) };
int err;
+ if (inode->i_sb->s_root == NULL) {
+ ext4_warning(inode->i_sb,
+ "refuse to create EA inode when umounting");
+ WARN_ON(1);
+ return ERR_PTR(-EINVAL);
+ }
+
/*
* Let the next inode be the goal, so we try and allocate the EA inode
* in the same group, or nearby one.
Patches currently in stable-queue which might be from jun.nie@xxxxxxxxxx are
queue-4.19/ext4-optimize-ea_inode-block-expansion.patch
queue-4.19/ext4-refuse-to-create-ea-block-when-umounted.patch
