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authorFelix Fietkau <nbd@nbd.name>2020-01-23 17:40:06 +0100
committerPetr Štetiar <ynezz@true.cz>2020-01-28 16:39:02 +0100
commit8ab2b42fac4fcbb4a294f3405aa15daeb706a9bd (patch)
tree3e325d797df2090a0d443fab33d4c22875959e13 /target/linux/generic
parent47935940d67147e3ec8dbfcb56ae14f1235369c5 (diff)
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kernel: fix dst reference leak in flow offload
Fixes a significant amount of leaked memory with lots of connections Ref: PR#2721 Tested-by: Jerome Benoit <jerome.benoit@sap.com> [WRT1900AC v1] Signed-off-by: Felix Fietkau <nbd@nbd.name> [removed 4.19 patch during cherry-pick] Signed-off-by: Petr Štetiar <ynezz@true.cz> (cherry picked from commit c6c4701def07cd01a1b077cee93f64a9b2e3b5be)
Diffstat (limited to 'target/linux/generic')
-rw-r--r--target/linux/generic/hack-4.14/650-netfilter-add-xt_OFFLOAD-target.patch23
1 files changed, 12 insertions, 11 deletions
diff --git a/target/linux/generic/hack-4.14/650-netfilter-add-xt_OFFLOAD-target.patch b/target/linux/generic/hack-4.14/650-netfilter-add-xt_OFFLOAD-target.patch
index a78b4cdf9c..7c93feccdc 100644
--- a/target/linux/generic/hack-4.14/650-netfilter-add-xt_OFFLOAD-target.patch
+++ b/target/linux/generic/hack-4.14/650-netfilter-add-xt_OFFLOAD-target.patch
@@ -98,7 +98,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
obj-$(CONFIG_NETFILTER_XT_TARGET_LED) += xt_LED.o
--- /dev/null
+++ b/net/netfilter/xt_FLOWOFFLOAD.c
-@@ -0,0 +1,421 @@
+@@ -0,0 +1,422 @@
+/*
+ * Copyright (C) 2018 Felix Fietkau <nbd@nbd.name>
+ *
@@ -330,15 +330,16 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
+
+ this_dst = xt_flowoffload_dst(ct, !dir, par, xt_out(par)->ifindex);
+ other_dst = xt_flowoffload_dst(ct, dir, par, xt_in(par)->ifindex);
++
++ route->tuple[dir].dst = this_dst;
++ route->tuple[!dir].dst = other_dst;
++
+ if (!this_dst || !other_dst)
+ return -ENOENT;
+
+ if (dst_xfrm(this_dst) || dst_xfrm(other_dst))
+ return -EINVAL;
+
-+ route->tuple[dir].dst = this_dst;
-+ route->tuple[!dir].dst = other_dst;
-+
+ return 0;
+}
+
@@ -350,7 +351,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
+ enum ip_conntrack_info ctinfo;
+ enum ip_conntrack_dir dir;
+ struct nf_flow_route route;
-+ struct flow_offload *flow;
++ struct flow_offload *flow = NULL;
+ struct nf_conn *ct;
+ struct net *net;
+
@@ -392,12 +393,14 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
+
+ dir = CTINFO2DIR(ctinfo);
+
-+ if (xt_flowoffload_route(skb, ct, par, &route, dir) < 0)
-+ goto err_flow_route;
++ if (xt_flowoffload_route(skb, ct, par, &route, dir) == 0)
++ flow = flow_offload_alloc(ct, &route);
++
++ dst_release(route.tuple[dir].dst);
++ dst_release(route.tuple[!dir].dst);
+
-+ flow = flow_offload_alloc(ct, &route);
+ if (!flow)
-+ goto err_flow_alloc;
++ goto err_flow_route;
+
+ if (tcph) {
+ ct->proto.tcp.seen[0].flags |= IP_CT_TCP_FLAG_BE_LIBERAL;
@@ -421,8 +424,6 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
+
+err_flow_add:
+ flow_offload_free(flow);
-+err_flow_alloc:
-+ dst_release(route.tuple[!dir].dst);
+err_flow_route:
+ clear_bit(IPS_OFFLOAD_BIT, &ct->status);
+ return XT_CONTINUE;