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Commit 6d0bfe226116 ("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: 6d0bfe226116 ("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>
a03dc36bdc