ipv6: fix cleanup ordering for pingv6 registration
Commit 6d0bfe22 ("net: ipv6: Add IPv6 support to the ping socket.") contains an error in the cleanup path of inet6_init(): when proto_register(&pingv6_prot, 1) fails, we try to unregister &pingv6_prot. When rawv6_init() fails, we skip unregistering &pingv6_prot. Example of panic (triggered by faking a failure of proto_register(&pingv6_prot, 1)): general protection fault: 0000 [#1] PREEMPT SMP KASAN PTI [...] RIP: 0010:__list_del_entry_valid+0x79/0x160 [...] Call Trace: proto_unregister+0xbb/0x550 ? trace_preempt_on+0x6f0/0x6f0 ? sock_no_shutdown+0x10/0x10 inet6_init+0x153/0x1b8 Fixes: 6d0bfe22 ("net: ipv6: Add IPv6 support to the ping socket.") Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: David S. Miller <davem@davemloft.net>
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