Update Linux CVE patches

Patches/Linux_CVEs/CVE-2017-5970/ANY/0.patch

@@ -0,0 +1,47 @@
+From 34b2cef20f19c87999fff3da4071e66937db9644 Mon Sep 17 00:00:00 2001
+From: Eric Dumazet <edumazet@google.com>
+Date: Sat, 4 Feb 2017 11:16:52 -0800
+Subject: ipv4: keep skb->dst around in presence of IP options
+
+Andrey Konovalov got crashes in __ip_options_echo() when a NULL skb->dst
+is accessed.
+
+ipv4_pktinfo_prepare() should not drop the dst if (evil) IP options
+are present.
+
+We could refine the test to the presence of ts_needtime or srr,
+but IP options are not often used, so let's be conservative.
+
+Thanks to syzkaller team for finding this bug.
+
+Fixes: d826eb14ecef ("ipv4: PKTINFO doesnt need dst reference")
+Signed-off-by: Eric Dumazet <edumazet@google.com>
+Reported-by: Andrey Konovalov <andreyknvl@google.com>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ net/ipv4/ip_sockglue.c | 9 ++++++++-
+ 1 file changed, 8 insertions(+), 1 deletion(-)
+
+diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
+index 53ae0c6..9000117 100644
+--- a/net/ipv4/ip_sockglue.c
++++ b/net/ipv4/ip_sockglue.c
+@@ -1238,7 +1238,14 @@ void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
+ 		pktinfo->ipi_ifindex = 0;
+ 		pktinfo->ipi_spec_dst.s_addr = 0;
+ 	}
+-	skb_dst_drop(skb);
++	/* We need to keep the dst for __ip_options_echo()
++	 * We could restrict the test to opt.ts_needtime || opt.srr,
++	 * but the following is good enough as IP options are not often used.
++	 */
++	if (unlikely(IPCB(skb)->opt.optlen))
++		skb_dst_force(skb);
++	else
++		skb_dst_drop(skb);
+ }
+ 
+ int ip_setsockopt(struct sock *sk, int level,
+-- 
+cgit v1.1
+