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| author | Pan Bian <bianpan2016@163.com> | 2018-12-04 07:28:02 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-01-13 12:07:11 +0300 |
| commit | d3f10a0116520e6ed383246eb877664c83308232 (patch) | |
| tree | 29b7d4e8edfae3b21d68662a63d0e7715bf62ba6 /fs/ext4 | |
| parent | af860a6a026a3b50cf49bc4602dcb882acae108e (diff) | |
| download | linux-d3f10a0116520e6ed383246eb877664c83308232.tar.xz | |
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>
Diffstat (limited to 'fs/ext4')
| -rw-r--r-- | fs/ext4/super.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index c81c04288dcd..0aa7c5250f87 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -5389,9 +5389,9 @@ static int ext4_quota_enable(struct super_block *sb, int type, int format_id, qf_inode->i_flags |= S_NOQUOTA; lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA); err = dquot_enable(qf_inode, type, format_id, flags); - iput(qf_inode); if (err) lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL); + iput(qf_inode); return err; } |