From: Di Zhu <[email protected]>
We encountered a crash: in the packet receiving process, we got an
illegal VLAN device address, but the VLAN device address saved in vmcore
is correct. After checking the code, we found a possible data
competition:
CPU 0: CPU 1:
(RCU read lock) (RTNL lock)
vlan_do_receive() register_vlan_dev()
vlan_find_dev()
->__vlan_group_get_device() ->vlan_group_prealloc_vid()
In vlan_group_prealloc_vid(), We need to make sure that kzalloc is
executed before assigning a value to vlan devices array, otherwise we
may get a wrong address from the hardware cache on another cpu.
So fix it by adding memory barrier instruction to ensure the order
of memory operations.
Signed-off-by: Di Zhu <[email protected]>
---
net/8021q/vlan.c | 2 ++
net/8021q/vlan.h | 3 +++
2 files changed, 5 insertions(+)
diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index 8b644113715e..4f541e05cd3f 100644
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -71,6 +71,8 @@ static int vlan_group_prealloc_vid(struct vlan_group *vg,
if (array == NULL)
return -ENOBUFS;
+ smp_wmb();
+
vg->vlan_devices_arrays[pidx][vidx] = array;
return 0;
}
diff --git a/net/8021q/vlan.h b/net/8021q/vlan.h
index 953405362795..7408fda084d3 100644
--- a/net/8021q/vlan.h
+++ b/net/8021q/vlan.h
@@ -57,6 +57,9 @@ static inline struct net_device
*__vlan_group_get_device(struct vlan_group *vg,
array = vg->vlan_devices_arrays[pidx]
[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
+
+ smp_rmb();
+
return array ? array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] : NULL;
}
--
2.23.0
