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bpf: Cleanup ftrace hash in bpf_trampoline_put

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We need to release possible hash from trampoline fops object
before removing it, otherwise we leak it.

Fixes: 00963a2e75 ("bpf: Support bpf_trampoline on functions with IPMODIFY (e.g. livepatch)")
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/bpf/20220802135651.1794015-1-jolsa@kernel.org
This commit is contained in:
Jiri Olsa 2022-08-02 15:56:51 +02:00 • committed by Andrii Nakryiko
parent e2dcac2f58
commit 62d468e5e1
1 changed files with 4 additions and 1 deletions
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5
kernel/bpf/trampoline.c
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@ -841,7 +841,10 @@ void bpf_trampoline_put(struct bpf_trampoline *tr)
* multiple rcu callbacks. * multiple rcu callbacks.
*/ */
hlist_del(&tr->hlist); hlist_del(&tr->hlist);
kfree(tr->fops); if (tr->fops) {
ftrace_free_filter(tr->fops);
kfree(tr->fops);
}
kfree(tr); kfree(tr);
out: out:
mutex_unlock(&trampoline_mutex); mutex_unlock(&trampoline_mutex);