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kernel: fix a race condition leading to a crash in hw flow offloading 

flowtable->net was initialized too late, and this could be triggered even
without hardware offload support on the device

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2022-02-14 13:58:38 +01:00
parent 54e1a6fced
commit ebe0b2af65
1 changed files with 6 additions and 5 deletions
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11
target/linux/generic/hack-5.10/650-netfilter-add-xt_FLOWOFFLOAD-target.patch
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@ -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 +1,656 @@
@@ -0,0 +1,657 @@
+/*
+ * Copyright (C) 2018-2021 Felix Fietkau <nbd@nbd.name>
+ *
@ -575,16 +575,17 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
+ }
+
+ table = &flowtable[!!(info->flags & XT_FLOWOFFLOAD_HW)];
+
+ net = read_pnet(&table->ft.net);
+ if (!net)
+ write_pnet(&table->ft.net, xt_net(par));
+
+ if (flow_offload_add(&table->ft, flow) < 0)
+ goto err_flow_add;
+
+ xt_flowoffload_check_device(table, devs[0]);
+ xt_flowoffload_check_device(table, devs[1]);
+
+ net = read_pnet(&table->ft.net);
+ if (!net)
+ write_pnet(&table->ft.net, xt_net(par));
+
+ dst_release(route.tuple[dir].dst);
+ dst_release(route.tuple[!dir].dst);
+