linux-kernel - [PATCH] bpf: Clean up all resources when register_fprobe

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Message-Id: <20221025080628.523300-1-nashuiliang@gmail.com>
Date:   Tue, 25 Oct 2022 16:06:28 +0800
From:   Chuang Wang <nashuiliang@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Chuang Wang <nashuiliang@...il.com>, stable@...r.kernel.org,
        Song Liu <song@...nel.org>, Jiri Olsa <jolsa@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] bpf: Clean up all resources when register_fprobe_ips returns an error

When register_fprobe_ips returns an error, bpf_link_cleanup just cleans
up bpf_link_primer's resources and forgets to clean up
bpf_kprobe_multi_link, addrs, cookies.

So, by adding 'goto error', this ensures that all resources are cleaned
up.

Cc: stable@...r.kernel.org
Fixes: 0dcac2725406 ("bpf: Add multi kprobe link")
Signed-off-by: Chuang Wang <nashuiliang@...il.com>
---
 kernel/trace/bpf_trace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 1ed08967fb97..5b806ef20857 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -2778,7 +2778,7 @@ int bpf_kprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr
 	err = register_fprobe_ips(&link->fp, addrs, cnt);
 	if (err) {
 		bpf_link_cleanup(&link_primer);
-		return err;
+		goto error;
 	}
 
 	return bpf_link_settle(&link_primer);
-- 
2.34.1