58 lines
2.5 KiB
Diff
58 lines
2.5 KiB
Diff
From: Matthias Schiffer <mschiffer@universe-factory.net>
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Date: Mon, 2 Nov 2015 02:02:02 +0100
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Subject: ipv6: fix crash on ICMPv6 redirects with prohibited/blackholed source
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There are other error values besides ip6_null_entry that can be returned by
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ip6_route_redirect(): fib6_rule_action() can also result in
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ip6_blk_hole_entry and ip6_prohibit_entry if such ip rules are installed.
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Only checking for ip6_null_entry in rt6_do_redirect() causes ip6_ins_rt()
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to be called with rt->rt6i_table == NULL in these cases, making the kernel
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crash.
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diff --git a/target/linux/generic/patches-3.18/672-ipv6-fix-crash-on-ICMPv6-redirects-with-prohibited-blackholed-source.patch b/target/linux/generic/patches-3.18/672-ipv6-fix-crash-on-ICMPv6-redirects-with-prohibited-blackholed-source.patch
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new file mode 100644
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index 0000000..6e4b3da
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--- /dev/null
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+++ b/target/linux/generic/patches-3.18/672-ipv6-fix-crash-on-ICMPv6-redirects-with-prohibited-blackholed-source.patch
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@@ -0,0 +1,39 @@
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+From 7426eb388ade0f1ad800c408d7efa227d4f41408 Mon Sep 17 00:00:00 2001
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+Message-Id: <7426eb388ade0f1ad800c408d7efa227d4f41408.1446425986.git.mschiffer@universe-factory.net>
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+From: Matthias Schiffer <mschiffer@universe-factory.net>
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+Date: Mon, 2 Nov 2015 01:05:15 +0100
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+Subject: [PATCH] ipv6: fix crash on ICMPv6 redirects with
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+ prohibited/blackholed source
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+
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+There are other error values besides ip6_null_entry that can be returned by
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+ip6_route_redirect(): fib6_rule_action() can also result in
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+ip6_blk_hole_entry and ip6_prohibit_entry if such ip rules are installed.
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+
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+Only checking for ip6_null_entry in rt6_do_redirect() causes ip6_ins_rt()
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+to be called with rt->rt6i_table == NULL in these cases, making the kernel
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+crash.
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+
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+Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
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+---
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+ net/ipv6/route.c | 3 +--
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+ 1 file changed, 1 insertion(+), 2 deletions(-)
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+
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+--- a/net/ipv6/route.c
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++++ b/net/ipv6/route.c
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+@@ -1766,7 +1766,6 @@ static int ip6_route_del(struct fib6_con
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+
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+ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
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+ {
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+- struct net *net = dev_net(skb->dev);
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+ struct netevent_redirect netevent;
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+ struct rt6_info *rt, *nrt = NULL;
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+ struct ndisc_options ndopts;
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+@@ -1827,7 +1826,7 @@ static void rt6_do_redirect(struct dst_e
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+ }
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+
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+ rt = (struct rt6_info *) dst;
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+- if (rt == net->ipv6.ip6_null_entry) {
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++ if (rt->rt6i_flags & RTF_REJECT) {
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+ net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
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+ return;
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+ }
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