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libbpf: Fix memory leak in legacy kprobe attach logic

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In some error scenarios legacy_probe string won't be free()'d. Fix this.
This was reported by Coverity static analysis.

Fixes: ca304b40c2 ("libbpf: Introduce legacy kprobe events support")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210921210036.1545557-2-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko 2021-09-21 14:00:33 -07:00 committed by Alexei Starovoitov
parent cf8980a362
commit 303a257223
1 changed files with 7 additions and 3 deletions
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10
tools/lib/bpf/libbpf.c
View file

@ -9365,10 +9365,11 @@ bpf_program__attach_kprobe_opts(const struct bpf_program *prog,
offset, -1 /* pid */);
}
if (pfd < 0) {
err = pfd;
pr_warn("prog '%s': failed to create %s '%s' perf event: %s\n",
prog->name, retprobe ? "kretprobe" : "kprobe", func_name,
libbpf_strerror_r(pfd, errmsg, sizeof(errmsg)));
return libbpf_err_ptr(pfd);
libbpf_strerror_r(err, errmsg, sizeof(errmsg)));
goto err_out;
}
link = bpf_program__attach_perf_event_opts(prog, pfd, &pe_opts);
err = libbpf_get_error(link);
@ -9377,7 +9378,7 @@ bpf_program__attach_kprobe_opts(const struct bpf_program *prog,
pr_warn("prog '%s': failed to attach to %s '%s': %s\n",
prog->name, retprobe ? "kretprobe" : "kprobe", func_name,
libbpf_strerror_r(err, errmsg, sizeof(errmsg)));
return libbpf_err_ptr(err);
goto err_out;
}
if (legacy) {
struct bpf_link_perf *perf_link = container_of(link, struct bpf_link_perf, link);
@ -9387,6 +9388,9 @@ bpf_program__attach_kprobe_opts(const struct bpf_program *prog,
}
return link;
err_out:
free(legacy_probe);
return libbpf_err_ptr(err);
}
struct bpf_link *bpf_program__attach_kprobe(const struct bpf_program *prog,