linux-kernel - [PATCH 4.14 10/29] net: ipv6: unexport __init-annotated seg6_hmac_net

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Date:   Tue,  5 Jul 2022 13:57:58 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hulk Robot <hulkci@...wei.com>,
        YueHaibing <yuehaibing@...wei.com>,
        Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH 4.14 10/29] net: ipv6: unexport __init-annotated seg6_hmac_net_init()

From: YueHaibing <yuehaibing@...wei.com>

commit 53ad46169fe2996fe1b623ba6c9c4fa33847876f upstream.

As of commit 5801f064e351 ("net: ipv6: unexport __init-annotated seg6_hmac_init()"),
EXPORT_SYMBOL and __init is a bad combination because the .init.text
section is freed up after the initialization. Hence, modules cannot
use symbols annotated __init. The access to a freed symbol may end up
with kernel panic.

This remove the EXPORT_SYMBOL to fix modpost warning:

WARNING: modpost: vmlinux.o(___ksymtab+seg6_hmac_net_init+0x0): Section mismatch in reference from the variable __ksymtab_seg6_hmac_net_init to the function .init.text:seg6_hmac_net_init()
The symbol seg6_hmac_net_init is exported and annotated __init
Fix this by removing the __init annotation of seg6_hmac_net_init or drop the export.

Fixes: bf355b8d2c30 ("ipv6: sr: add core files for SR HMAC support")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: YueHaibing <yuehaibing@...wei.com>
Link: https://lore.kernel.org/r/20220628033134.21088-1-yuehaibing@huawei.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv6/seg6_hmac.c |    1 -
 1 file changed, 1 deletion(-)

--- a/net/ipv6/seg6_hmac.c
+++ b/net/ipv6/seg6_hmac.c
@@ -414,7 +414,6 @@ int __net_init seg6_hmac_net_init(struct

 	return 0;
 }
-EXPORT_SYMBOL(seg6_hmac_net_init);

 void seg6_hmac_exit(void)
 {