diff options
| author | Jun Nie <jun.nie@linaro.org> | 2023-01-03 04:45:17 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-10 11:34:20 +0300 |
| commit | 05cbf6ddd9847c7b4f0662c048f195b09405a9d0 (patch) | |
| tree | 7db9d92e8f4dc487bd4a32dd3198f91a8f4d5ffb /fs/ext4/xattr.c | |
| parent | 8b6d06b3be7648b3b0f428558293ddf6e2cb94bf (diff) | |
| download | linux-05cbf6ddd9847c7b4f0662c048f195b09405a9d0.tar.xz | |
ext4: refuse to create ea block when umounted
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>
Diffstat (limited to 'fs/ext4/xattr.c')
| -rw-r--r-- | fs/ext4/xattr.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c index 107b2088e005..099a87ec9b2a 100644 --- a/fs/ext4/xattr.c +++ b/fs/ext4/xattr.c @@ -1422,6 +1422,13 @@ 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. |