From: Andrii Nakryiko <andrii@kernel.org>
Date: Thu, 3 Dec 2020 12:46:22 -0800
Subject: bpf: Keep module's btf_data_size intact after load
Git-commit: 2fe8890848c799515a881502339a0a7b2b555988
Patch-mainline: v5.11-rc1
References: jsc#SLE-24559

Having real btf_data_size stored in struct module is benefitial to quickly
determine which kernel modules have associated BTF object and which don't.
There is no harm in keeping this info, as opposed to keeping invalid pointer.

Fixes: 607c543f939d ("bpf: Sanitize BTF data pointer after module is loaded")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20201203204634.1325171-3-andrii@kernel.org

Acked-by: Jeff Mahoney <jeffm@suse.com>
---
 kernel/module.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/kernel/module.c b/kernel/module.c
index 18f259d61d14..c3a9e972d3b2 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -3712,7 +3712,6 @@ static noinline int do_init_module(struct module *mod)
 #ifdef CONFIG_DEBUG_INFO_BTF_MODULES
 	/* .BTF is not SHF_ALLOC and will get removed, so sanitize pointer */
 	mod->btf_data = NULL;
-	mod->btf_data_size = 0;
 #endif
 	/*
 	 * We want to free module_init, but be aware that kallsyms may be