kernel/bpf/syscall.c

3265 	/* tgt_prog is NULL if target is a kernel function */
3266 	if (tr_link->tgt_prog)
3267 		bpf_prog_put(tr_link->tgt_prog);
3323 	struct bpf_prog *tgt_prog = NULL;
3372 		tgt_prog = bpf_prog_get(tgt_prog_fd);
3373 		if (IS_ERR(tgt_prog)) {
3374 			err = PTR_ERR(tgt_prog);
3375 			tgt_prog = NULL;
3379 		key = bpf_trampoline_compute_key(tgt_prog, NULL, btf_id);
3403 	 * - if tgt_prog != NULL, the caller specified tgt_prog_fd +
3406 	 * - if tgt_prog == NULL when this function was called using the old
3409 	 * - if prog->aux->dst_trampoline and tgt_prog is NULL, the program
3412 	 * - if prog->aux->dst_trampoline is NULL and tgt_prog and prog->aux->attach_btf
3416 	if (!prog->aux->dst_trampoline && !tgt_prog) {
3445 		err = bpf_check_attach_target(NULL, prog, tgt_prog, btf_id,
3469 		tgt_prog = prog->aux->dst_prog;
3483 	link->tgt_prog = tgt_prog;
3509 	if (tgt_prog_fd && tgt_prog)
3510 		bpf_prog_put(tgt_prog);