A-Team_Digital_Solutions/android_kernel_motorola_sm6375
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android_kernel_motorola_sm6375/net/nfc
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Repository files (latest commit first)
Filename Latest commit message Latest commit date
Duoming Zhou 3277789f33 NFC: nci: fix sleep in atomic context bugs caused by nci_skb_alloc 
[ Upstream commit 23dd4581350d4ffa23d58976ec46408f8f4c1e16 ]

There are sleep in atomic context bugs when the request to secure
element of st-nci is timeout. The root cause is that nci_skb_alloc
with GFP_KERNEL parameter is called in st_nci_se_wt_timeout which is
a timer handler. The call paths that could trigger bugs are shown below:

    (interrupt context 1)
st_nci_se_wt_timeout
  nci_hci_send_event
    nci_hci_send_data
      nci_skb_alloc(..., GFP_KERNEL) //may sleep

   (interrupt context 2)
st_nci_se_wt_timeout
  nci_hci_send_event
    nci_hci_send_data
      nci_send_data
        nci_queue_tx_data_frags
          nci_skb_alloc(..., GFP_KERNEL) //may sleep

This patch changes allocation mode of nci_skb_alloc from GFP_KERNEL to
GFP_ATOMIC in order to prevent atomic context sleeping. The GFP_ATOMIC
flag makes memory allocation operation could be used in atomic context.

Fixes: ed06aeefda ("nfc: st-nci: Rename st21nfcb to st-nci")
Signed-off-by: Duoming Zhou <duoming@zju.edu.cn>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220517012530.75714-1-duoming@zju.edu.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-05-25 09:14:36 +02:00
..
hci
nci NFC: nci: fix sleep in atomic context bugs caused by nci_skb_alloc 2022-05-25 09:14:36 +02:00
af_nfc.c nfc: fix error handling of nfc_proto_register() 2021-10-20 11:40:16 +02:00
core.c nfc: replace improper check device_is_registered() in netlink related functions 2022-05-12 12:23:44 +02:00
digital.h
digital_core.c NFC: digital: fix possible memory leak in digital_tg_listen_mdaa() 2021-10-20 11:40:16 +02:00
digital_dep.c net:nfc:digital: Fix a double free in digital_tg_recv_dep_req 2021-05-14 09:44:32 +02:00
digital_technology.c NFC: digital: fix possible memory leak in digital_in_send_sdd_req() 2021-10-20 11:40:16 +02:00
Kconfig
llcp.h
llcp_commands.c
llcp_core.c
llcp_sock.c nfc: llcp: fix NULL error pointer dereference on sendmsg() after failed bind() 2022-01-27 09:19:26 +01:00
Makefile
netlink.c NFC: netlink: fix sleep in atomic bug when firmware download timeout 2022-05-12 12:23:44 +02:00
nfc.h
rawsock.c net/nfc/rawsock.c: fix a permission check bug 2021-06-16 11:59:33 +02:00