On Wed, Dec 13, 2023 at 06:49:11PM +0800, Ke Xiao wrote:
> Commit 3116f59c12bd ("i40e: fix use-after-free in
> i40e_sync_filters_subtask()") avoided use-after-free issues,
> by increasing refcount during update the VSI filter list to
> the HW. However, it missed the unicast situation.
>
> When deleting an unicast FDB entry, the i40e driver will release
> the mac_filter, and i40e_service_task will concurrently request
> firmware to add the mac_filter, which will lead to the following
> use-after-free issue.
>
> Fix again for both netdev->uc and netdev->mc.
>
> BUG: KASAN: use-after-free in i40e_aqc_add_filters+0x55c/0x5b0 [i40e]
> Read of size 2 at addr ffff888eb3452d60 by task kworker/8:7/6379
>
> CPU: 8 PID: 6379 Comm: kworker/8:7 Kdump: loaded Tainted: G
> Workqueue: i40e i40e_service_task [i40e]
> Call Trace:
> dump_stack+0x71/0xab
> print_address_description+0x6b/0x290
> kasan_report+0x14a/0x2b0
> i40e_aqc_add_filters+0x55c/0x5b0 [i40e]
> i40e_sync_vsi_filters+0x1676/0x39c0 [i40e]
> i40e_service_task+0x1397/0x2bb0 [i40e]
> process_one_work+0x56a/0x11f0
> worker_thread+0x8f/0xf40
> kthread+0x2a0/0x390
> ret_from_fork+0x1f/0x40
>
> Allocated by task 21948:
> kasan_kmalloc+0xa6/0xd0
> kmem_cache_alloc_trace+0xdb/0x1c0
> i40e_add_filter+0x11e/0x520 [i40e]
> i40e_addr_sync+0x37/0x60 [i40e]
> __hw_addr_sync_dev+0x1f5/0x2f0
> i40e_set_rx_mode+0x61/0x1e0 [i40e]
> dev_uc_add_excl+0x137/0x190
> i40e_ndo_fdb_add+0x161/0x260 [i40e]
> rtnl_fdb_add+0x567/0x950
> rtnetlink_rcv_msg+0x5db/0x880
> netlink_rcv_skb+0x254/0x380
> netlink_unicast+0x454/0x610
> netlink_sendmsg+0x747/0xb00
> sock_sendmsg+0xe2/0x120
> __sys_sendto+0x1ae/0x290
> __x64_sys_sendto+0xdd/0x1b0
> do_syscall_64+0xa0/0x370
> entry_SYSCALL_64_after_hwframe+0x65/0xca
>
> Freed by task 21948:
> __kasan_slab_free+0x137/0x190
> kfree+0x8b/0x1b0
> __i40e_del_filter+0x116/0x1e0 [i40e]
> i40e_del_mac_filter+0x16c/0x300 [i40e]
> i40e_addr_unsync+0x134/0x1b0 [i40e]
> __hw_addr_sync_dev+0xff/0x2f0
> i40e_set_rx_mode+0x61/0x1e0 [i40e]
> dev_uc_del+0x77/0x90
> rtnl_fdb_del+0x6a5/0x860
> rtnetlink_rcv_msg+0x5db/0x880
> netlink_rcv_skb+0x254/0x380
> netlink_unicast+0x454/0x610
> netlink_sendmsg+0x747/0xb00
> sock_sendmsg+0xe2/0x120
> __sys_sendto+0x1ae/0x290
> __x64_sys_sendto+0xdd/0x1b0
> do_syscall_64+0xa0/0x370
> entry_SYSCALL_64_after_hwframe+0x65/0xca
>
> Fixes: 3116f59c12bd ("i40e: fix use-after-free in
> i40e_sync_filters_subtask()")
> Fixes: 41c445ff0f48 ("i40e: main driver core")
> Signed-off-by: Ke Xiao <xia...@sangfor.com.cn>
> Signed-off-by: Ding Hui <ding...@sangfor.com.cn>
> Cc: Di Zhu <zhu...@huawei.com>
Reviewed-by: Simon Horman <ho...@kernel.org>
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