libbpf: Clean gen_loader's attach kind.

[ Upstream commit 19250f5fc0c283892a61f3abf9d65e6325f63897 ]

The gen_loader has to clear attach_kind otherwise the programs
without attach_btf_id will fail load if they follow programs
with attach_btf_id.

Fixes: 67234743736a ("libbpf: Generate loader program out of BPF ELF file.")
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20211201181040.23337-12-alexei.starovoitov@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/tools/lib/bpf/gen_loader.c b/tools/lib/bpf/gen_loader.c
index 8df718a..33c1959 100644 (file)
--- a/tools/lib/bpf/gen_loader.c
+++ b/tools/lib/bpf/gen_loader.c
@@ -663,9 +663,11 @@ void bpf_gen__prog_load(struct bpf_gen *gen,
        debug_ret(gen, "prog_load %s insn_cnt %d", attr.prog_name, attr.insn_cnt);
        /* successful or not, close btf module FDs used in extern ksyms and attach_btf_obj_fd */
        cleanup_relos(gen, insns);
-       if (gen->attach_kind)
+       if (gen->attach_kind) {
                emit_sys_close_blob(gen,
                                    attr_field(prog_load_attr, attach_btf_obj_fd));
+               gen->attach_kind = 0;
+       }
        emit_check_err(gen);
        /* remember prog_fd in the stack, if successful */
        emit(gen, BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_7,