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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: e10360f815 ("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
This commit is contained in:
Andrii Nakryiko 2020-03-09 15:40:17 -07:00 committed by Alexei Starovoitov
parent 62039c30c1
commit 1d8006abaa
1 changed files with 3 additions and 0 deletions
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kernel/bpf/cgroup.c
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@ -227,6 +227,9 @@ int cgroup_bpf_inherit(struct cgroup *cgrp)
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;