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| author | Tejun Heo <tj@kernel.org> | 2016-02-28 16:59:33 +0300 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2016-03-01 00:22:52 +0300 |
| commit | fa5ff8a1c43fc7b78353059899edf3cbedf54e9f (patch) | |
| tree | 7ce1a04b33df6a78fe3041b53136df246aae1296 | |
| parent | d22025570e2ebfc68819b35c5d457e53d9337217 (diff) | |
| download | linux-fa5ff8a1c43fc7b78353059899edf3cbedf54e9f.tar.xz | |
cgroup: fix and restructure error handling in copy_cgroup_ns()
copy_cgroup_ns()'s error handling was broken and the attempt to fix it
d22025570e2e ("cgroup: fix alloc_cgroup_ns() error handling in
copy_cgroup_ns()") was broken too in that it ended up trying an
ERR_PTR() value.
There's only one place where copy_cgroup_ns() needs to perform cleanup
after failure. Simplify and fix the error handling by removing the
goto's.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>
| -rw-r--r-- | kernel/cgroup.c | 18 |
1 files changed, 5 insertions, 13 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c index d92d91a4bb3e..2c88149da848 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -6058,9 +6058,8 @@ struct cgroup_namespace *copy_cgroup_ns(unsigned long flags, struct user_namespace *user_ns, struct cgroup_namespace *old_ns) { - struct cgroup_namespace *new_ns = NULL; - struct css_set *cset = NULL; - int err; + struct cgroup_namespace *new_ns; + struct css_set *cset; BUG_ON(!old_ns); @@ -6070,9 +6069,8 @@ struct cgroup_namespace *copy_cgroup_ns(unsigned long flags, } /* Allow only sysadmin to create cgroup namespace. */ - err = -EPERM; if (!ns_capable(user_ns, CAP_SYS_ADMIN)) - goto err_out; + return ERR_PTR(-EPERM); mutex_lock(&cgroup_mutex); spin_lock_bh(&css_set_lock); @@ -6085,20 +6083,14 @@ struct cgroup_namespace *copy_cgroup_ns(unsigned long flags, new_ns = alloc_cgroup_ns(); if (IS_ERR(new_ns)) { - err = PTR_ERR(new_ns); - goto err_out; + put_css_set(cset); + return new_ns; } new_ns->user_ns = get_user_ns(user_ns); new_ns->root_cset = cset; return new_ns; - -err_out: - if (cset) - put_css_set(cset); - kfree(new_ns); - return ERR_PTR(err); } static inline struct cgroup_namespace *to_cg_ns(struct ns_common *ns) |