From: Sabrina Dubroca <sd@queasysnail.net>
Date: Tue, 28 Aug 2018 11:40:53 +0000 (+0200)
Subject: net: rtnl: return early from rtnl_unregister_all when protocol isn't registered
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=f707ef61e17261f2bb18c3e4871c6f135ab3aba9;p=linux.git

net: rtnl: return early from rtnl_unregister_all when protocol isn't registered

rtnl_unregister_all(PF_INET6) gets called from inet6_init in cases when
no handler has been registered for PF_INET6 yet, for example if
ip6_mr_init() fails. Abort and avoid a NULL pointer deref in that case.

Example of panic (triggered by faking a failure of
 register_pernet_subsys):

    general protection fault: 0000 [#1] PREEMPT SMP KASAN PTI
    [...]
    RIP: 0010:rtnl_unregister_all+0x17e/0x2a0
    [...]
    Call Trace:
     ? rtnetlink_net_init+0x250/0x250
     ? sock_unregister+0x103/0x160
     ? kernel_getsockopt+0x200/0x200
     inet6_init+0x197/0x20d

Fixes: e2fddf5e96df ("[IPV6]: Make af_inet6 to check ip6_route_init return value.")
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 24431e578310c..60c928894a786 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -324,6 +324,10 @@ void rtnl_unregister_all(int protocol)
 
 	rtnl_lock();
 	tab = rtnl_msg_handlers[protocol];
+	if (!tab) {
+		rtnl_unlock();
+		return;
+	}
 	RCU_INIT_POINTER(rtnl_msg_handlers[protocol], NULL);
 	for (msgindex = 0; msgindex < RTM_NR_MSGTYPES; msgindex++) {
 		link = tab[msgindex];