tree 116aa3454ca28f117c70c2a8384436a92368d598
parent 9da1f6d06b7a6d068e68fcfd7cbbf6b586d888e1
author Pan Bian <bianpan2016@163.com> 1543897682 -0500
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1547050489 +0100

ext4: fix possible use after free in ext4_quota_enable

commit 61157b24e60fb3cd1f85f2c76a7b1d628f970144 upstream.

The function frees qf_inode via iput but then pass qf_inode to
lockdep_set_quota_inode on the failure path. This may result in a
use-after-free bug. The patch frees df_inode only when it is never used.

Fixes: daf647d2dd5 ("ext4: add lockdep annotations for i_data_sem")
Cc: stable@kernel.org # 4.6
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Pan Bian <bianpan2016@163.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>