libbpf: Fix error message in attach_kprobe_session

We just failed to retrieve pattern, so we need to print spec instead.

Fixes: 2ca178f02b2f ("libbpf: Add support for kprobe session attach")
Reported-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20240502075541.1425761-1-jolsa@kernel.org

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 4ffc8873d1ad7e246f6a2eb1ff0153658be7d5f5..68c87aed83354134b17f0cd64bde3a1ed2ffe42a 100644 (file)
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -11605,7 +11605,7 @@ static int attach_kprobe_session(const struct bpf_program *prog, long cookie,
        spec = prog->sec_name + sizeof("kprobe.session/") - 1;
        n = sscanf(spec, "%m[a-zA-Z0-9_.*?]", &pattern);
        if (n < 1) {
-               pr_warn("kprobe session pattern is invalid: %s\n", pattern);
+               pr_warn("kprobe session pattern is invalid: %s\n", spec);
                return -EINVAL;
        }