nfc: nfcsim: fix use after free during module unload
There is a use after free memory corruption during module exit: - nfcsim_exit() - nfcsim_device_free(dev0) - nfc_digital_unregister_device() This iterates over command queue and frees all commands, - dev->up = false - nfcsim_link_shutdown() - nfcsim_link_recv_wake() This wakes the sleeping thread nfcsim_link_recv_skb(). - nfcsim_link_recv_skb() Wake from wait_event_interruptible_timeout(), call directly the deb->cb callback even though (dev->up == false), - digital_send_cmd_complete() Dereference of "struct digital_cmd" cmd which was freed earlier by nfc_digital_unregister_device(). This causes memory corruption shortly after (with unrelated stack trace): nfc nfc0: NFC: nfcsim_recv_wq: Device is down llcp: nfc_llcp_recv: err -19 nfc nfc1: NFC: nfcsim_recv_wq: Device is down BUG: unable to handle page fault for address: ffffffffffffffed Call Trace: fsnotify+0x54b/0x5c0 __fsnotify_parent+0x1fe/0x300 ? vfs_write+0x27c/0x390 vfs_write+0x27c/0x390 ksys_write+0x63/0xe0 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae KASAN report: BUG: KASAN: use-after-free in digital_send_cmd_complete+0x16/0x50 Write of size 8 at addr ffff88800a05f720 by task kworker/0:2/71 Workqueue: events nfcsim_recv_wq [nfcsim] Call Trace: dump_stack_lvl+0x45/0x59 print_address_description.constprop.0+0x21/0x140 ? digital_send_cmd_complete+0x16/0x50 ? digital_send_cmd_complete+0x16/0x50 kasan_report.cold+0x7f/0x11b ? digital_send_cmd_complete+0x16/0x50 ? digital_dep_link_down+0x60/0x60 digital_send_cmd_complete+0x16/0x50 nfcsim_recv_wq+0x38f/0x3d5 [nfcsim] ? nfcsim_in_send_cmd+0x4a/0x4a [nfcsim] ? lock_is_held_type+0x98/0x110 ? finish_wait+0x110/0x110 ? rcu_read_lock_sched_held+0x9c/0xd0 ? rcu_read_lock_bh_held+0xb0/0xb0 ? lockdep_hardirqs_on_prepare+0x12e/0x1f0 This flow of calling digital_send_cmd_complete() callback on driver exit is specific to nfcsim which implements reading and sending work queues. Since the NFC digital device was unregistered, the callback should not be called. Fixes: 204bddcb ("NFC: nfcsim: Make use of the Digital layer") Cc: <stable@vger.kernel.org> Signed-off-by:Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
parent
76a16be0