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| author | Wang Liang <wangliang74@huawei.com> | 2025-11-07 06:59:02 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-11-24 12:30:04 +0300 |
| commit | 52b44d8c653459c658b733d13658afdde45f6836 (patch) | |
| tree | ff5426d4410b76ed175be82bfafcaca0545b0edc | |
| parent | e91ecc2e30b4f9fa74384705f129d363e85ce728 (diff) | |
| download | linux-52b44d8c653459c658b733d13658afdde45f6836.tar.xz | |
net: fix NULL pointer dereference in l3mdev_l3_rcv
[ Upstream commit 0032c99e83b9ce6d5995d65900aa4b6ffb501cce ]
When delete l3s ipvlan:
ip link del link eth0 ipvlan1 type ipvlan mode l3s
This may cause a null pointer dereference:
Call trace:
ip_rcv_finish+0x48/0xd0
ip_rcv+0x5c/0x100
__netif_receive_skb_one_core+0x64/0xb0
__netif_receive_skb+0x20/0x80
process_backlog+0xb4/0x204
napi_poll+0xe8/0x294
net_rx_action+0xd8/0x22c
__do_softirq+0x12c/0x354
This is because l3mdev_l3_rcv() visit dev->l3mdev_ops after
ipvlan_l3s_unregister() assign the dev->l3mdev_ops to NULL. The process
like this:
(CPU1) | (CPU2)
l3mdev_l3_rcv() |
check dev->priv_flags: |
master = skb->dev; |
|
| ipvlan_l3s_unregister()
| set dev->priv_flags
| dev->l3mdev_ops = NULL;
|
visit master->l3mdev_ops |
To avoid this by do not set dev->l3mdev_ops when unregister l3s ipvlan.
Suggested-by: David Ahern <dsahern@kernel.org>
Fixes: c675e06a98a4 ("ipvlan: decouple l3s mode dependencies from other modes")
Signed-off-by: Wang Liang <wangliang74@huawei.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250321090353.1170545-1-wangliang74@huawei.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Rajani Kantha <681739313@139.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/net/ipvlan/ipvlan_l3s.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/net/ipvlan/ipvlan_l3s.c b/drivers/net/ipvlan/ipvlan_l3s.c index d5b05e803219..ca35a50bb640 100644 --- a/drivers/net/ipvlan/ipvlan_l3s.c +++ b/drivers/net/ipvlan/ipvlan_l3s.c @@ -224,5 +224,4 @@ void ipvlan_l3s_unregister(struct ipvl_port *port) dev->priv_flags &= ~IFF_L3MDEV_RX_HANDLER; ipvlan_unregister_nf_hook(read_pnet(&port->pnet)); - dev->l3mdev_ops = NULL; } |