The unexpected MPLS packet may not end with the bottom label stack.
When there are many stacks, The label count value has wrapped around.
A dead loop occurs, soft lockup/CPU stuck finally.
stack backtrace:
UBSAN: array-index-out-of-bounds in
/build/linux-0Pa0xK/linux-5.15.0/net/openvswitch/flow.c:662:26
index -1 is out of range for type '__be32 [3]'
CPU: 34 PID: 0 Comm: swapper/34 Kdump: loaded Tainted: G OE
5.15.0-121-generic #131-Ubuntu
Hardware name: Dell Inc. PowerEdge C6420/0JP9TF, BIOS 2.12.2 07/14/2021
Call Trace:
<IRQ>
show_stack+0x52/0x5c
dump_stack_lvl+0x4a/0x63
dump_stack+0x10/0x16
ubsan_epilogue+0x9/0x36
__ubsan_handle_out_of_bounds.cold+0x44/0x49
key_extract_l3l4+0x82a/0x840 [openvswitch]
? kfree_skbmem+0x52/0xa0
key_extract+0x9c/0x2b0 [openvswitch]
ovs_flow_key_extract+0x124/0x350 [openvswitch]
ovs_vport_receive+0x61/0xd0 [openvswitch]
? kernel_init_free_pages.part.0+0x4a/0x70
? get_page_from_freelist+0x353/0x540
netdev_port_receive+0xc4/0x180 [openvswitch]
? netdev_port_receive+0x180/0x180 [openvswitch]
netdev_frame_hook+0x1f/0x40 [openvswitch]
__netif_receive_skb_core.constprop.0+0x23a/0xf00
__netif_receive_skb_list_core+0xfa/0x240
netif_receive_skb_list_internal+0x18e/0x2a0
napi_complete_done+0x7a/0x1c0
bnxt_poll+0x155/0x1c0 [bnxt_en]
__napi_poll+0x30/0x180
net_rx_action+0x126/0x280
? bnxt_msix+0x67/0x80 [bnxt_en]
handle_softirqs+0xda/0x2d0
irq_exit_rcu+0x96/0xc0
common_interrupt+0x8e/0xa0
</IRQ>
Fixes: fbdcdd78da7c ("Change in Openvswitch to support MPLS label depth of 3 in
ingress direction")
Signed-off-by: Faicker Mo <faicker...@zenlayer.com>
---
v2
- Changed return value based on Eelco's feedback.
- Added Fixes.
---
net/openvswitch/flow.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
index 8a848ce72e29..c16850d4ba24 100644
--- a/net/openvswitch/flow.c
+++ b/net/openvswitch/flow.c
@@ -805,6 +805,8 @@ static int key_extract_l3l4(struct sk_buff *skb, struct
sw_flow_key *key)
if (label_count <= MPLS_LABEL_DEPTH)
memcpy(&key->mpls.lse[label_count - 1], &lse,
MPLS_HLEN);
+ else if (unlikely(label_count == 255))
+ return -EINVAL;
skb_set_inner_network_header(skb, skb->mac_len +
label_count * MPLS_HLEN);
--
2.34.1
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