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| author | Li Guifu <bluce.liguifu@huawei.com> | 2020-07-24 09:38:11 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-09-03 11:24:21 +0200 |
| commit | 8cfbac12a68bb660491759d56e37049a05289691 (patch) | |
| tree | 073507756b3de89afa01767f671fc64c1c9e1583 | |
| parent | 9094d83e14661b0fe8c1d7014e734443b8f4cbb0 (diff) | |
| download | linux-stable-8cfbac12a68bb660491759d56e37049a05289691.tar.gz linux-stable-8cfbac12a68bb660491759d56e37049a05289691.tar.bz2 linux-stable-8cfbac12a68bb660491759d56e37049a05289691.zip | |
f2fs: fix use-after-free issue
[ Upstream commit 99c787cfd2bd04926f1f553b30bd7dcea2caaba1 ]
During umount, f2fs_put_super() unregisters procfs entries after
f2fs_destroy_segment_manager(), it may cause use-after-free
issue when umount races with procfs accessing, fix it by relocating
f2fs_unregister_sysfs().
[Chao Yu: change commit title/message a bit]
Signed-off-by: Li Guifu <bluce.liguifu@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | fs/f2fs/super.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 9782250c9815..161ce0eb8891 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -1004,6 +1004,9 @@ static void f2fs_put_super(struct super_block *sb) int i; bool dropped; + /* unregister procfs/sysfs entries in advance to avoid race case */ + f2fs_unregister_sysfs(sbi); + f2fs_quota_off_umount(sb); /* prevent remaining shrinker jobs */ @@ -1067,8 +1070,6 @@ static void f2fs_put_super(struct super_block *sb) kfree(sbi->ckpt); - f2fs_unregister_sysfs(sbi); - sb->s_fs_info = NULL; if (sbi->s_chksum_driver) crypto_free_shash(sbi->s_chksum_driver); |