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cgroup: don't put ERR_PTR() into fc->root 

the caller of ->get_tree() expects NULL left there on error...

Reported-by: Thibaut Sautereau <thibaut@sautereau.fr>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2019-11-10 11:53:27 -05:00
parent 03ad0d703d
commit 630faf81b3
1 changed files with 3 additions and 2 deletions
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5
kernel/cgroup/cgroup.c
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@ -2119,11 +2119,12 @@ int cgroup_do_get_tree(struct fs_context *fc)
nsdentry = kernfs_node_dentry(cgrp->kn, sb);
dput(fc->root);
fc->root = nsdentry;
if (IS_ERR(nsdentry)) {
ret = PTR_ERR(nsdentry);
deactivate_locked_super(sb);
ret = PTR_ERR(nsdentry);
nsdentry = NULL;
}
fc->root = nsdentry;
}
if (!ctx->kfc.new_sb_created)