libbpf: Fix strncat bounds error in libbpf_prog_type_by_name

[linux-2.6-microblaze.git] / tools / lib / bpf / libbpf.c

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 8b4d765..d71631a 100644 (file)
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -4690,7 +4690,7 @@ int libbpf_prog_type_by_name(const char *name, enum bpf_prog_type *prog_type,
                        }
                        /* prepend "btf_trace_" prefix per kernel convention */
                        strncat(dst, name + section_names[i].len,
-                               sizeof(raw_tp_btf_name) - (dst - raw_tp_btf_name));
+                               sizeof(raw_tp_btf_name) - sizeof("btf_trace_"));
                        ret = btf__find_by_name(btf, raw_tp_btf_name);
                        btf__free(btf);
                        if (ret <= 0) {