linux-kernel - 4.19 queue: netfilter: conntrack: unregister ipv4 sockopts on error unwind

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Message-ID: <20210607223854.GA12130@amd>
Date:   Tue, 8 Jun 2021 00:38:54 +0200
From:   Pavel Machek <pavel@...x.de>
To:     sashal@...nel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, fw@...len.de, pablo@...filter.org
Subject: 4.19 queue: netfilter: conntrack: unregister ipv4 sockopts on error
 unwind

Hi!

That patch is wrong for 4.19. Wrong version is 066585c43 in stable
queue.

    netfilter: conntrack: unregister ipv4 sockopts on error unwind

    [ Upstream commit 22cbdbcfb61acc78d5fc21ebb13ccc0d7e29f793 ]

    When ipv6 sockopt register fails, the ipv4 one needs to be
    removed.

...

+++ b/net/netfilter/nf_conntrack_proto.c
@@ -962,7 +962,7 @@ int nf_conntrack_proto_init(void)
 nf_unregister_sockopt(&so_getorigdst);
 #if IS_ENABLED(CONFIG_IPV6)
cleanup_sockopt:
 -       nf_unregister_sockopt(&so_getorigdst6);
 +       nf_unregister_sockopt(&so_getorigdst);
 #endif
 return ret;

Note the context. cleanup_sockopt2: needs to do
nf_unregister_sockopt(&so_getorigdst6);, otherwise we end up
unregistering the same pointer twice.

(AFAICT it is ok in mainline and 5.10).

Best regards,
								Pavel
		   
-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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