bpf: Fix cgroup ref leak in cgroup_bpf_inherit on out-of-memory

There is no compensating cgroup_bpf_put() for each ancestor cgroup in
cgroup_bpf_inherit(). If compute_effective_progs returns error, those cgroups
won't be freed ever. Fix it by putting them in cleanup code path.

Fixes: e10360f815ca ("bpf: cgroup: prevent out-of-order release of cgroup bpf")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Roman Gushchin <guro@fb.com>
Link: https://lore.kernel.org/bpf/20200309224017.1063297-1-andriin@fb.com

diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c
index b2bc4c3..4f14724 100644 (file)
--- a/kernel/bpf/cgroup.c
+++ b/kernel/bpf/cgroup.c
@@ -227,6 +227,9 @@ cleanup:
        for (i = 0; i < NR; i++)
                bpf_prog_array_free(arrays[i]);
 
+       for (p = cgroup_parent(cgrp); p; p = cgroup_parent(p))
+               cgroup_bpf_put(p);
+
        percpu_ref_exit(&cgrp->bpf.refcnt);
 
        return -ENOMEM;