Duoming Zhou af3c4bf1f1 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 09:10:39 +02:00
..
core.c	nfc: nci: add flush_workqueue to prevent uaf	2022-04-20 09:12:49 +02:00
data.c	NFC: nci: fix sleep in atomic context bugs caused by nci_skb_alloc	2022-05-25 09:10:39 +02:00
hci.c	NFC: nci: fix sleep in atomic context bugs caused by nci_skb_alloc	2022-05-25 09:10:39 +02:00
Kconfig
lib.c
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
rsp.c	nfc: nci: fix the UAF of rf_conn_info object	2021-10-27 09:53:14 +02:00
spi.c
uart.c	net: nfc: nci: fix a possible sleep-in-atomic-context bug in nci_uart_tty_receive()	2019-12-31 16:34:38 +01:00