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| author | Pan Bian <bianpan2016@163.com> | 2018-12-03 23:28:02 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-01-09 16:16:43 +0100 |
| commit | 836bf269c56ff1d707b40a64dc8eef6754c2c24e (patch) | |
| tree | 104fc3e428b526e4f9b83c5e6c157aa96a83f7d6 | |
| parent | fdb2f4c79a86a5d289cce8a4c71dcd4b2c5845bd (diff) | |
| download | linux-stable-836bf269c56ff1d707b40a64dc8eef6754c2c24e.tar.gz linux-stable-836bf269c56ff1d707b40a64dc8eef6754c2c24e.tar.bz2 linux-stable-836bf269c56ff1d707b40a64dc8eef6754c2c24e.zip | |
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>
| -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 75177eb498ed..67d9e3ce47e9 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -5425,9 +5425,9 @@ 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; } |