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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org,
	Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
	"David S. Miller" <davem@davemloft.net>
Subject: [PATCH 5.4 18/40] nfc: nfcsim: fix use after free during module unload
Date: Mon,  2 Aug 2021 15:44:58 +0200	[thread overview]
Message-ID: <20210802134335.971241777@linuxfoundation.org> (raw)
In-Reply-To: <20210802134335.408294521@linuxfoundation.org>

From: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>

commit 5e7b30d24a5b8cb691c173b45b50e3ca0191be19 upstream.

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: 204bddcb508f ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/nfc/nfcsim.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/nfc/nfcsim.c
+++ b/drivers/nfc/nfcsim.c
@@ -192,8 +192,7 @@ static void nfcsim_recv_wq(struct work_s
 
 		if (!IS_ERR(skb))
 			dev_kfree_skb(skb);
-
-		skb = ERR_PTR(-ENODEV);
+		return;
 	}
 
 	dev->cb(dev->nfc_digital_dev, dev->arg, skb);



  parent reply	other threads:[~2021-08-02 13:57 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-02 13:44 [PATCH 5.4 00/40] 5.4.138-rc1 review Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 5.4 01/40] net_sched: check error pointer in tcf_dump_walker() Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 5.4 02/40] x86/asm: Ensure asm/proto.h can be included stand-alone Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 5.4 03/40] btrfs: fix rw device counting in __btrfs_free_extra_devids Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 5.4 04/40] btrfs: mark compressed range uptodate only if all bio succeed Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 5.4 05/40] Revert "ACPI: resources: Add checks for ACPI IRQ override" Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 5.4 06/40] x86/kvm: fix vcpu-id indexed array sizes Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 5.4 07/40] KVM: add missing compat KVM_CLEAR_DIRTY_LOG Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 5.4 08/40] ocfs2: fix zero out valid data Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 5.4 09/40] ocfs2: issue zeroout to EOF blocks Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 5.4 10/40] can: j1939: j1939_xtp_rx_dat_one(): fix rxtimer value between consecutive TP.DT to 750ms Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 5.4 11/40] can: raw: raw_setsockopt(): fix raw_rcv panic for sock UAF Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 5.4 12/40] can: mcba_usb_start(): add missing urb->transfer_dma initialization Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 5.4 13/40] can: usb_8dev: fix memory leak Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 5.4 14/40] can: ems_usb: " Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 5.4 15/40] can: esd_usb2: " Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 5.4 16/40] HID: wacom: Re-enable touch by default for Cintiq 24HDT / 27QHDT Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 5.4 17/40] NIU: fix incorrect error return, missed in previous revert Greg Kroah-Hartman
2021-08-02 13:44 ` Greg Kroah-Hartman [this message]
2021-08-02 13:44 ` [PATCH 5.4 19/40] cfg80211: Fix possible memory leak in function cfg80211_bss_update Greg Kroah-Hartman
2021-08-02 13:45 ` [PATCH 5.4 20/40] netfilter: conntrack: adjust stop timestamp to real expiry value Greg Kroah-Hartman
2021-08-02 13:45 ` [PATCH 5.4 21/40] netfilter: nft_nat: allow to specify layer 4 protocol NAT only Greg Kroah-Hartman
2021-08-02 13:45 ` [PATCH 5.4 22/40] i40e: Fix logic of disabling queues Greg Kroah-Hartman
2021-08-02 13:45 ` [PATCH 5.4 23/40] i40e: Fix firmware LLDP agent related warning Greg Kroah-Hartman
2021-08-02 13:45 ` [PATCH 5.4 24/40] i40e: Fix queue-to-TC mapping on Tx Greg Kroah-Hartman
2021-08-02 13:45 ` [PATCH 5.4 25/40] i40e: Fix log TC creation failure when max num of queues is exceeded Greg Kroah-Hartman
2021-08-02 13:45 ` [PATCH 5.4 26/40] tipc: fix sleeping in tipc accept routine Greg Kroah-Hartman
2021-08-02 13:45 ` [PATCH 5.4 27/40] net: Set true network header for ECN decapsulation Greg Kroah-Hartman
2021-08-02 13:45 ` [PATCH 5.4 28/40] mlx4: Fix missing error code in mlx4_load_one() Greg Kroah-Hartman
2021-08-02 13:45 ` [PATCH 5.4 29/40] net: llc: fix skb_over_panic Greg Kroah-Hartman
2021-08-02 13:45 ` [PATCH 5.4 30/40] net/mlx5: Fix flow table chaining Greg Kroah-Hartman
2021-08-02 13:45 ` [PATCH 5.4 31/40] net/mlx5e: Fix nullptr in mlx5e_hairpin_get_mdev() Greg Kroah-Hartman
2021-08-02 13:45 ` [PATCH 5.4 32/40] sctp: fix return value check in __sctp_rcv_asconf_lookup Greg Kroah-Hartman
2021-08-02 13:45 ` [PATCH 5.4 33/40] tulip: windbond-840: Fix missing pci_disable_device() in probe and remove Greg Kroah-Hartman
2021-08-02 13:45 ` [PATCH 5.4 34/40] sis900: " Greg Kroah-Hartman
2021-08-02 13:45 ` [PATCH 5.4 35/40] can: hi311x: fix a signedness bug in hi3110_cmd() Greg Kroah-Hartman
2021-08-02 13:45 ` [PATCH 5.4 36/40] PCI: mvebu: Setup BAR0 in order to fix MSI Greg Kroah-Hartman
2021-08-02 13:45 ` [PATCH 5.4 37/40] powerpc/pseries: Fix regression while building external modules Greg Kroah-Hartman
2021-08-02 13:45 ` [PATCH 5.4 38/40] Revert "perf map: Fix dso->nsinfo refcounting" Greg Kroah-Hartman
2021-08-02 13:45 ` [PATCH 5.4 39/40] i40e: Add additional info to PHY type error Greg Kroah-Hartman
2021-08-02 13:45 ` [PATCH 5.4 40/40] can: j1939: j1939_session_deactivate(): clarify lifetime of session object Greg Kroah-Hartman
2021-08-03  9:12 ` [PATCH 5.4 00/40] 5.4.138-rc1 review Naresh Kamboju
2021-08-03 10:35 ` Sudip Mukherjee
2021-08-03 19:16 ` Guenter Roeck

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