linux-kernel - [PATCH 4.9 55/66] NFC: netlink: fix sleep in atomic bug when firmware download timeout

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Message-Id: <20220510130731.379769655@linuxfoundation.org>
Date:   Tue, 10 May 2022 15:07:45 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Duoming Zhou <duoming@....edu.cn>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH 4.9 55/66] NFC: netlink: fix sleep in atomic bug when firmware download timeout

From: Duoming Zhou <duoming@....edu.cn>

commit 4071bf121d59944d5cd2238de0642f3d7995a997 upstream.

There are sleep in atomic bug that could cause kernel panic during
firmware download process. The root cause is that nlmsg_new with
GFP_KERNEL parameter is called in fw_dnld_timeout which is a timer
handler. The call trace is shown below:

BUG: sleeping function called from invalid context at include/linux/sched/mm.h:265
Call Trace:
kmem_cache_alloc_node
__alloc_skb
nfc_genl_fw_download_done
call_timer_fn
__run_timers.part.0
run_timer_softirq
__do_softirq
...

The nlmsg_new with GFP_KERNEL parameter may sleep during memory
allocation process, and the timer handler is run as the result of
a "software interrupt" that should not call any other function
that could sleep.

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

Fixes: 9674da8759df ("NFC: Add firmware upload netlink command")
Fixes: 9ea7187c53f6 ("NFC: netlink: Rename CMD_FW_UPLOAD to CMD_FW_DOWNLOAD")
Signed-off-by: Duoming Zhou <duoming@....edu.cn>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Link: https://lore.kernel.org/r/20220504055847.38026-1-duoming@zju.edu.cn
Signed-off-by: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/nfc/netlink.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -1254,7 +1254,7 @@ int nfc_genl_fw_download_done(struct nfc
 	struct sk_buff *msg;
 	void *hdr;

-	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 	if (!msg)
 		return -ENOMEM;

@@ -1270,7 +1270,7 @@ int nfc_genl_fw_download_done(struct nfc

 	genlmsg_end(msg, hdr);

-	genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
+	genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);

 	return 0;