Description
In the Linux kernel, the following vulnerability has been resolved: net: fix NULL pointer dereference in l3mdev_l3_rcv 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.
Product status
c675e06a98a474f7ad0af32ce467613da818da52 (git) before 52b44d8c653459c658b733d13658afdde45f6836
c675e06a98a474f7ad0af32ce467613da818da52 (git) before 59599bce44af3df7a215ebc81cb166426e1c9204
c675e06a98a474f7ad0af32ce467613da818da52 (git) before f9dff65140efc289f01bcf39c3ca66a8806b6132
c675e06a98a474f7ad0af32ce467613da818da52 (git) before 0032c99e83b9ce6d5995d65900aa4b6ffb501cce
5.1
Any version before 5.1
6.6.117 (semver)
6.12.46 (semver)
6.14.2 (semver)
6.15 (original_commit_for_fix)
References
git.kernel.org/...c/52b44d8c653459c658b733d13658afdde45f6836
git.kernel.org/...c/59599bce44af3df7a215ebc81cb166426e1c9204
git.kernel.org/...c/f9dff65140efc289f01bcf39c3ca66a8806b6132
git.kernel.org/...c/0032c99e83b9ce6d5995d65900aa4b6ffb501cce