Commit c29a4920 authored by Yuntao Wang's avatar Yuntao Wang Committed by Alexei Starovoitov
Browse files

bpf: Fix maximum permitted number of arguments check 



Since the m->arg_size array can hold up to MAX_BPF_FUNC_ARGS argument
sizes, it's ok that nargs is equal to MAX_BPF_FUNC_ARGS.

Signed-off-by: default avatarYuntao Wang <ytcoode@gmail.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Acked-by: default avatarMartin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20220324164238.1274915-1-ytcoode@gmail.com
parent 98870605

kernel/bpf/btf.c

+1 −1
Original line number Diff line number Diff line
@@ -5507,7 +5507,7 @@ int btf_distill_func_proto(struct bpf_verifier_log *log, 
	}

	args = (const struct btf_param *)(func + 1);

	nargs = btf_type_vlen(func);

	if (nargs >= MAX_BPF_FUNC_ARGS) {

	if (nargs > MAX_BPF_FUNC_ARGS) {

		bpf_log(log,

			"The function %s has %d arguments. Too many.\n",

			tname, nargs);