From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Jia-Ju Bai <baijiaju1990@gmail.com>,
"David S . Miller" <davem@davemloft.net>,
Sasha Levin <sashal@kernel.org>,
netdev@vger.kernel.org
Subject: [PATCH AUTOSEL 4.9 31/38] net: nfc: nci: fix a possible sleep-in-atomic-context bug in nci_uart_tty_receive()
Date: Fri, 27 Dec 2019 13:14:28 -0500 [thread overview]
Message-ID: <20191227181435.7644-31-sashal@kernel.org> (raw)
In-Reply-To: <20191227181435.7644-1-sashal@kernel.org>
From: Jia-Ju Bai <baijiaju1990@gmail.com>
[ Upstream commit b7ac893652cafadcf669f78452329727e4e255cc ]
The kernel may sleep while holding a spinlock.
The function call path (from bottom to top) in Linux 4.19 is:
net/nfc/nci/uart.c, 349:
nci_skb_alloc in nci_uart_default_recv_buf
net/nfc/nci/uart.c, 255:
(FUNC_PTR)nci_uart_default_recv_buf in nci_uart_tty_receive
net/nfc/nci/uart.c, 254:
spin_lock in nci_uart_tty_receive
nci_skb_alloc(GFP_KERNEL) can sleep at runtime.
(FUNC_PTR) means a function pointer is called.
To fix this bug, GFP_KERNEL is replaced with GFP_ATOMIC for
nci_skb_alloc().
This bug is found by a static analysis tool STCheck written by myself.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/nfc/nci/uart.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/nfc/nci/uart.c b/net/nfc/nci/uart.c
index c468eabd6943..90268b642907 100644
--- a/net/nfc/nci/uart.c
+++ b/net/nfc/nci/uart.c
@@ -348,7 +348,7 @@ static int nci_uart_default_recv_buf(struct nci_uart *nu, const u8 *data,
nu->rx_packet_len = -1;
nu->rx_skb = nci_skb_alloc(nu->ndev,
NCI_MAX_PACKET_SIZE,
- GFP_KERNEL);
+ GFP_ATOMIC);
if (!nu->rx_skb)
return -ENOMEM;
}
--
2.20.1
next prev parent reply other threads:[~2019-12-27 18:15 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-27 18:13 [PATCH AUTOSEL 4.9 01/38] mwifiex: fix possible heap overflow in mwifiex_process_country_ie() Sasha Levin
2019-12-27 18:13 ` [PATCH AUTOSEL 4.9 02/38] locking/spinlock/debug: Fix various data races Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 03/38] netfilter: ctnetlink: netns exit must wait for callbacks Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 04/38] efi/gop: Return EFI_NOT_FOUND if there are no usable GOPs Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 05/38] efi/gop: Return EFI_SUCCESS if a usable GOP was found Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 06/38] efi/gop: Fix memory leak in __gop_query32/64() Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 07/38] ARM: vexpress: Set-up shared OPP table instead of individual for each CPU Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 08/38] netfilter: uapi: Avoid undefined left-shift in xt_sctp.h Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 09/38] netfilter: bridge: make sure to pull arp header in br_nf_forward_arp() Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 10/38] spi: spi-cavium-thunderx: Add missing pci_release_regions() Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 11/38] af_packet: set defaule value for tmo Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 12/38] fjes: fix missed check in fjes_acpi_add Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 13/38] net: ena: fix napi handler misbehavior when the napi budget is zero Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 14/38] ARM: dts: am437x-gp/epos-evm: fix panel compatible Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 15/38] samples: bpf: Replace symbol compare of trace_event Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 16/38] tty: serial: msm_serial: Fix lockup for sysrq and oops Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 17/38] net: usb: lan78xx: Fix suspend/resume PHY register access error Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 18/38] powerpc: Ensure that swiotlb buffer is allocated from low memory Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 19/38] 6pack,mkiss: fix possible deadlock Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 20/38] bnx2x: Do not handle requests from VFs after parity Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 21/38] bnx2x: Fix logic to get total no. of PFs per engine Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 22/38] gtp: fix wrong condition in gtp_genl_dump_pdp() Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 23/38] gtp: avoid zero size hashtable Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 24/38] net: usb: lan78xx: Fix error message format specifier Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 25/38] rfkill: Fix incorrect check to avoid NULL pointer dereference Sasha Levin
2019-12-28 1:48 ` Justin Capella
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 26/38] ASoC: wm8962: fix lambda value Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 27/38] regulator: rn5t618: fix module aliases Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 28/38] kconfig: don't crash on NULL expressions in expr_eq() Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 29/38] perf/x86/intel: Fix PT PMI handling Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 30/38] net: qlogic: Fix error paths in ql_alloc_large_buffers() Sasha Levin
2019-12-27 18:14 ` Sasha Levin [this message]
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 32/38] net: stmmac: RX buffer size must be 16 byte aligned Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 33/38] net, sysctl: Fix compiler warning when only cBPF is present Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 34/38] block: fix memleak when __blk_rq_map_user_iov() is failed Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 35/38] parisc: Fix compiler warnings in debug_core.c Sasha Levin
2019-12-27 18:14 ` [PATCH AUTOSEL 4.9 36/38] net: hisilicon: Fix a BUG trigered by wrong bytes_compl Sasha Levin
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