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ext4: refuse to create ea block when umounted

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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@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?id=3613786cb88c93aa1c6a279b1df6a7b201347d08
Link: https://lore.kernel.org/r/20230103014517.495275-3-jun.nie@linaro.org
Cc: stable@kernel.org
Signed-off-by: Jun Nie <jun.nie@linaro.org>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jun Nie 2023-01-03 09:45:17 +08:00 committed by Greg Kroah-Hartman
parent d738789ae9
commit 0dc0fa313b
1 changed files with 7 additions and 0 deletions
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7
fs/ext4/xattr.c
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@ -1415,6 +1415,13 @@ static struct inode *ext4_xattr_inode_create(handle_t *handle,
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.