tree 59241241f8869ddd66c0056731f26ec5d61fcd53
parent d6ccc55e66ccdbc8ad0eeda14419f8eaccbc246b
author Tejun Heo <tj@kernel.org> 1466528784 -0400
committer Tejun Heo <tj@kernel.org> 1466528829 -0400

cgroup: allow NULL return from ss->css_alloc()

cgroup core expected css_alloc to return an ERR_PTR value on failure
and caused NULL deref if it returned NULL.  It's an easy mistake to
make from an alloc function and there's no ambiguity in what's being
indicated.  Update css_create() so that it interprets NULL return from
css_alloc as -ENOMEM.

Signed-off-by: Tejun Heo <tj@kernel.org>