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linux/net/nfc/nci
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Duoming Zhou 23dd458135 NFC: nci: fix sleep in atomic context bugs caused by nci_skb_alloc 
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>
2022-05-17 17:55:53 -07:00
..
core.c nfc: nci: add flush_workqueue to prevent uaf 2022-04-13 14:44:44 +01:00
data.c NFC: nci: fix sleep in atomic context bugs caused by nci_skb_alloc 2022-05-17 17:55:53 -07:00
hci.c NFC: nci: fix sleep in atomic context bugs caused by nci_skb_alloc 2022-05-17 17:55:53 -07:00
Kconfig treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
lib.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ntf.c nfc: drop unneeded debug prints 2021-10-11 17:00:51 -07:00
rsp.c nfc: nci: fix the UAF of rf_conn_info object 2021-10-08 17:24:32 +01:00
spi.c nfc: nci: constify several pointers to u8, sk_buff and other structs 2021-07-30 17:22:52 +02:00
uart.c tty: remove file from tty_ldisc_ops::ioctl and compat_ioctl 2021-11-25 18:36:27 +01:00