linux-kernel - [PATCH] libbpf: Use the correct fd when attaching to perf events

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Date:   Fri, 12 Mar 2021 13:43:15 -0800
From:   Sultan Alsawaf <sultan@...neltoast.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Sultan Alsawaf <sultan@...neltoast.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] libbpf: Use the correct fd when attaching to perf events

From: Sultan Alsawaf <sultan@...neltoast.com>

We should be using the program fd here, not the perf event fd.

Fixes: 63f2f5ee856ba ("libbpf: add ability to attach/detach BPF program to perf event")
Signed-off-by: Sultan Alsawaf <sultan@...neltoast.com>
---
 tools/lib/bpf/libbpf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index d43cc3f29dae..3d20d57d4af5 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -9538,7 +9538,7 @@ struct bpf_link *bpf_program__attach_perf_event(struct bpf_program *prog,
 	if (!link)
 		return ERR_PTR(-ENOMEM);
 	link->detach = &bpf_link__detach_perf_event;
-	link->fd = pfd;
+	link->fd = prog_fd;
 
 	if (ioctl(pfd, PERF_EVENT_IOC_SET_BPF, prog_fd) < 0) {
 		err = -errno;
-- 
2.30.2