From: Yuntao Wang <ytcoode@gmail.com>
Date: Fri, 25 Mar 2022 00:42:38 +0800
Subject: bpf: Fix maximum permitted number of arguments check
Patch-mainline: v5.18-rc1
Git-commit: c29a4920dfcaa1433b09e2674f605f72767a385c
References: jsc#PED-1377
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: Yuntao Wang <ytcoode@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20220324164238.1274915-1-ytcoode@gmail.com
Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
---
kernel/bpf/btf.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -5507,7 +5507,7 @@ int btf_distill_func_proto(struct bpf_ve
}
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);