From: Yoshiki Komachi <komachi.yoshiki@gmail.com>
Date: Tue, 10 Mar 2020 16:32:29 +0900
Subject: bpf/btf: Fix BTF verification of enum members in struct/union
Patch-mainline: v5.6
Git-commit: da6c7faeb103c493e505e87643272f70be586635
References: bsc#1154353 bsc#1155518

btf_enum_check_member() was currently sure to recognize the size of
"enum" type members in struct/union as the size of "int" even if
its size was packed.

This patch fixes BTF enum verification to use the correct size
of member in BPF programs.

Fixes: 179cde8cef7e ("bpf: btf: Check members of struct/union")
Signed-off-by: Yoshiki Komachi <komachi.yoshiki@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/1583825550-18606-2-git-send-email-komachi.yoshiki@gmail.com
Acked-by: Gary Lin <glin@suse.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 kernel/bpf/btf.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -2383,7 +2383,7 @@ static int btf_enum_check_member(struct
 
 	struct_size = struct_type->size;
 	bytes_offset = BITS_ROUNDDOWN_BYTES(struct_bits_off);
-	if (struct_size - bytes_offset < sizeof(int)) {
+	if (struct_size - bytes_offset < member_type->size) {
 		btf_verifier_log_member(env, struct_type, member,
 					"Member exceeds struct_size");
 		return -EINVAL;