CVE-2013-4348 net: deadloop path in skb_flow_dissect (rhbz 1007939 1025647)

PatchList.txt

@@ -1,5 +1,8 @@
 **** Backports and patches headed/already upsteram *****************************
 
+* net-flow_dissector-fail-on-evil-iph-ihl.patch (rhbz 1007939 1025647)
+  - Should hit upstream and stable soon
+
 * alps-Support-for-Dell-XT2-model.patch (rhbz 1023413)
   - http://article.gmane.org/gmane.linux.kernel.input/32484
 

kernel.spec

@@ -736,6 +736,9 @@ Patch25132: rt2800usb-slow-down-TX-status-polling.patch
 #rhbz 1023413
 Patch25133: alps-Support-for-Dell-XT2-model.patch
 
+#CVE-2013-4348 rhbz 1007939 1025647
+Patch25139: net-flow_dissector-fail-on-evil-iph-ihl.patch
+
 # END OF PATCH DEFINITIONS
 
 %endif
@@ -1441,6 +1444,9 @@ ApplyPatch rt2800usb-slow-down-TX-status-polling.patch
 #rhbz 1023413
 ApplyPatch alps-Support-for-Dell-XT2-model.patch
 
+#CVE-2013-4348 rhbz 1007939 1025647
+ApplyPatch net-flow_dissector-fail-on-evil-iph-ihl.patch
+
 # END OF PATCH APPLICATIONS
 
 %endif
@@ -2244,6 +2250,9 @@ fi
 #                                    ||----w |
 #                                    ||     ||
 %changelog
+* Fri Nov 01 2013 Josh Boyer <jwboyer@fedoraproject.org>
+- CVE-2013-4348 net: deadloop path in skb_flow_dissect (rhbz 1007939 1025647)
+
 * Thu Oct 31 2013 Josh Boyer <jwboyer@fedoraproject.org> - 3.12.0-0.rc7.git2.1
 - Linux v3.12-rc7-48-g12aee27
 

net-flow_dissector-fail-on-evil-iph-ihl.patch

@@ -0,0 +1,82 @@
+Path: news.gmane.org!not-for-mail
+From: Jason Wang <jasowang@redhat.com>
+Newsgroups: gmane.linux.kernel,gmane.linux.network
+Subject: [PATCH net] net: flow_dissector: fail on evil iph->ihl
+Date: Fri,  1 Nov 2013 15:01:10 +0800
+Lines: 34
+Approved: news@gmane.org
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+Cc: Jason Wang <jasowang@redhat.com>,
+	Petr Matousek <pmatouse@redhat.com>,
+	"Michael S. Tsirkin" <mst@redhat.com>,
+	Daniel Borkmann <dborkman@redhat.com>
+To: davem@davemloft.net, edumazet@google.com, netdev@vger.kernel.org,
+	linux-kernel@vger.kernel.org
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+Archived-At: <http://permalink.gmane.org/gmane.linux.kernel/1588387>
+
+We don't validate iph->ihl which may lead a dead loop if we meet a IPIP
+skb whose iph->ihl is zero. Fix this by failing immediately when iph->ihl
+is evil (less than 5).
+
+This issue were introduced by commit ec5efe7946280d1e84603389a1030ccec0a767ae
+(rps: support IPIP encapsulation).
+
+Cc: Eric Dumazet <edumazet@google.com>
+Cc: Petr Matousek <pmatouse@redhat.com>
+Cc: Michael S. Tsirkin <mst@redhat.com>
+Cc: Daniel Borkmann <dborkman@redhat.com>
+Signed-off-by: Jason Wang <jasowang@redhat.com>
+---
+This patch is needed for stable.
+---
+ net/core/flow_dissector.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
+index 8d7d0dd..143b6fd 100644
+--- a/net/core/flow_dissector.c
++++ b/net/core/flow_dissector.c
+@@ -40,7 +40,7 @@ again:
+ 		struct iphdr _iph;
+ ip:
+ 		iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph);
+-		if (!iph)
++		if (!iph || iph->ihl < 5)
+ 			return false;
+ 
+ 		if (ip_is_fragment(iph))
+-- 
+1.8.1.2
+