[ I can't actually checkout that hash, but probably the bug report is
correct. ]
Hi Tejun,
FYI, there are new smatch warnings show up in
tree: git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git
review-post-kernfs-conversion
head: f38cf7665be19d00532d12eb5ae057f12cffb924
commit: cd71b9c15a8f80b5ee9daa2aef006b95fe8d5cf8 [24/32] cgroup: convert to
kernfs
kernel/cgroup.c:1554 cgroup_mount() error: 'root' dereferencing possible
ERR_PTR()
git remote add cgroup
git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git
git remote update cgroup
git checkout cd71b9c15a8f80b5ee9daa2aef006b95fe8d5cf8
vim +/root +1554 kernel/cgroup.c
cd71b9c1 Tejun Heo 2014-01-28 1538 }
cd71b9c1 Tejun Heo 2014-01-28 1539
cd71b9c1 Tejun Heo 2014-01-28 1540 ret = cgroup_setup_root(root);
cd71b9c1 Tejun Heo 2014-01-28 1541 if (ret)
cd71b9c1 Tejun Heo 2014-01-28 1542 cgroup_free_root(root);
cd71b9c1 Tejun Heo 2014-01-28 1543
b6829d78 Tejun Heo 2014-01-28 1544 out_unlock:
e25e2cbb Tejun Heo 2011-12-12 1545 mutex_unlock(&cgroup_mutex);
d685d7ed Tejun Heo 2014-01-28 1546 mutex_unlock(&cgroup_tree_mutex);
b6829d78 Tejun Heo 2014-01-28 1547
c6d57f33 Paul Menage 2009-09-23 1548 kfree(opts.release_agent);
c6d57f33 Paul Menage 2009-09-23 1549 kfree(opts.name);
b6829d78 Tejun Heo 2014-01-28 1550
cd71b9c1 Tejun Heo 2014-01-28 1551 if (ret)
b6829d78 Tejun Heo 2014-01-28 1552 return ERR_PTR(ret);
cd71b9c1 Tejun Heo 2014-01-28 1553
cd71b9c1 Tejun Heo 2014-01-28 @1554 dentry = kernfs_mount(fs_type, flags,
root->kf_root);
cd71b9c1 Tejun Heo 2014-01-28 1555 if (IS_ERR(dentry))
cd71b9c1 Tejun Heo 2014-01-28 1556 cgroup_put_root(root);
cd71b9c1 Tejun Heo 2014-01-28 1557 return dentry;
cd71b9c1 Tejun Heo 2014-01-28 1558 }
cd71b9c1 Tejun Heo 2014-01-28 1559
cd71b9c1 Tejun Heo 2014-01-28 1560 static void cgroup_kill_sb(struct
super_block *sb)
cd71b9c1 Tejun Heo 2014-01-28 1561 {
cd71b9c1 Tejun Heo 2014-01-28 1562 struct kernfs_root *kf_root =
kernfs_root_from_sb(sb);
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