6.12-stable review patch. If anyone has any objections, please let me know.
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From: Dmitry Skorodumov skorodumov.dmitry@huawei.com
[ Upstream commit 0c57ff008a11f24f7f05fa760222692a00465fec ]
Packets with pkt_type == PACKET_LOOPBACK are captured by handle_frame() function, but they don't have L2 header. We should not process them in handle_mode_l2().
This doesn't affect old L2 functionality, since handling was anyway incorrect.
Handle them the same way as in br_handle_frame(): just pass the skb.
To observe invalid behaviour, just start "ping -b" on bcast address of port-interface.
Fixes: 2ad7bf363841 ("ipvlan: Initial check-in of the IPVLAN driver.") Signed-off-by: Dmitry Skorodumov skorodumov.dmitry@huawei.com Link: https://patch.msgid.link/20251202103906.4087675-1-skorodumov.dmitry@huawei.c... Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ipvlan/ipvlan_core.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/net/ipvlan/ipvlan_core.c b/drivers/net/ipvlan/ipvlan_core.c index ca62188a317ad..83bd65a227709 100644 --- a/drivers/net/ipvlan/ipvlan_core.c +++ b/drivers/net/ipvlan/ipvlan_core.c @@ -737,6 +737,9 @@ static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb, struct ethhdr *eth = eth_hdr(skb); rx_handler_result_t ret = RX_HANDLER_PASS;
+ if (unlikely(skb->pkt_type == PACKET_LOOPBACK)) + return RX_HANDLER_PASS; + if (is_multicast_ether_addr(eth->h_dest)) { if (ipvlan_external_frame(skb, port)) { struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);