From: Miquel Raynal <miquel.raynal@bootlin.com>
To: Xuanqiang Luo <xuanqiang.luo@linux.dev>
Cc: linux-wpan@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, alex.aring@gmail.com,
stefan@datenfreihafen.org, david.girault@qorvo.com,
davem@davemloft.net, edumazet@google.com, kuba@kernel.org,
pabeni@redhat.com, horms@kernel.org, stable@vger.kernel.org,
Xuanqiang Luo <luoxuanqiang@kylinos.cn>
Subject: Re: [PATCH net v2 2/2] mac802154: pin netdevs for queued RX descriptors
Date: Fri, 04 Sep 2026 18:27:35 +0200 [thread overview]
Message-ID: <87ld9hyoaw.fsf@bootlin.com> (raw)
In-Reply-To: <20260903123202.60152-3-xuanqiang.luo@linux.dev> (Xuanqiang Luo's message of "Thu, 3 Sep 2026 20:32:02 +0800")
On 03/09/2026 at 20:32:02 +08, Xuanqiang Luo <xuanqiang.luo@linux.dev> wrote:
> From: Xuanqiang Luo <luoxuanqiang@kylinos.cn>
>
> The RX path keeps the receiving sub-interface in queued beacon and MAC
> command descriptors after leaving its RCU read-side critical section. An
> interface can therefore be unregistered and freed before mac_wq consumes
> the descriptor, leading to a use-after-free such as:
>
> BUG: KASAN: slab-use-after-free in mac802154_rx_mac_cmd_worker+0xc0/0x498 [mac802154]
> Read of size 8 at addr ffff0000c6db0ba8 by task kworker/u16:3/61
> ...
> Call trace:
> show_stack+0x20/0x38 (C)
> dump_stack_lvl+0x78/0x90
> print_address_description.constprop.0+0x88/0x398
> print_report+0xa8/0x278
> kasan_report+0xa8/0xf8
> __asan_load8+0x9c/0xc0
> mac802154_rx_mac_cmd_worker+0xc0/0x498 [mac802154]
> process_one_work+0x334/0x8b8
> ...
> Allocated by task 630:
> kasan_save_stack+0x2c/0x58
> kasan_save_track+0x20/0x40
> kasan_save_alloc_info+0x40/0x58
> __kasan_kmalloc+0xa0/0xb8
> __kvmalloc_node_noprof+0x1e8/0x588
> alloc_netdev_mqs+0x74/0x7f0
> ieee802154_if_add+0xac/0x630 [mac802154]
> ieee802154_register_hw+0x31c/0x3d0 [mac802154]
> fakelb_add_one+0x250/0x318 [fakelb]
> ...
> Freed by task 652:
> kasan_save_stack+0x2c/0x58
> kasan_save_track+0x20/0x40
> kasan_save_free_info+0x4c/0x78
> __kasan_slab_free+0x60/0x90
> kfree+0x194/0x478
> kvfree+0x44/0x60
> netdev_release+0x4c/0x68
> device_release+0xac/0x130
> kobject_cleanup+0x84/0x248
> kobject_put+0x98/0xf8
> netdev_run_todo+0x3a0/0x5e0
> rtnl_unlock+0x18/0x30
> ieee802154_unregister_hw+0x48/0x90 [mac802154]
> fakelb_remove+0xe8/0x148 [fakelb]
>
> Hold the receiving netdev from before a descriptor is queued until the
> descriptor is released. Since sdata is the netdev's private data, this also
> keeps sdata valid while a worker or scan cleanup accesses the descriptor.
>
> Fixes: 57588c71177f ("mac802154: Handle passive scanning")
> Fixes: d021d218f6d9 ("mac802154: Handle received BEACON_REQ")
> Cc: stable@vger.kernel.org
> Signed-off-by: Xuanqiang Luo <luoxuanqiang@kylinos.cn>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
next prev parent reply other threads:[~2026-09-04 16:27 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-03 12:32 [PATCH net v2 0/2] mac802154: fix queued RX descriptor lifetime Xuanqiang Luo
2026-09-03 12:32 ` [PATCH net v2 1/2] mac802154: serialize and drain queued RX descriptors Xuanqiang Luo
2026-09-04 16:27 ` Miquel Raynal
2026-09-03 12:32 ` [PATCH net v2 2/2] mac802154: pin netdevs for " Xuanqiang Luo
2026-09-04 16:27 ` Miquel Raynal [this message]
2026-09-05 6:02 ` [PATCH net v2 0/2] mac802154: fix queued RX descriptor lifetime Xuanqiang Luo
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