From: Jia-Ju Bai <baijiaju1990@gmail.com>
To: gregkh@linuxfoundation.org, johan@kernel.org,
paulmck@linux.vnet.ibm.com, mingo@kernel.org,
mark.rutland@arm.com, bjorn@mork.no, viro@zeniv.linux.org.uk
Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
Jia-Ju Bai <baijiaju1990@gmail.com>
Subject: [PATCH] usb: cdc-wdm: Fix a sleep-in-atomic-context bug in service_outstanding_interrupt()
Date: Sat, 1 Sep 2018 16:03:34 +0800 [thread overview]
Message-ID: <20180901080334.15913-1-baijiaju1990@gmail.com> (raw)
wdm_in_callback() is a completion handler function for the USB driver.
So it should not sleep.
To fix this bug, GFP_KERNEL is replaced with GFP_ATOMIC.
This bug is found by my static analysis tool DSAC.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
---
drivers/usb/class/cdc-wdm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index a0d284ef3f40..632a2bfabc08 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -458,7 +458,7 @@ static int service_outstanding_interrupt(struct wdm_device *desc)
set_bit(WDM_RESPONDING, &desc->flags);
spin_unlock_irq(&desc->iuspin);
- rv = usb_submit_urb(desc->response, GFP_KERNEL);
+ rv = usb_submit_urb(desc->response, GFP_ATOMIC);
spin_lock_irq(&desc->iuspin);
if (rv) {
dev_err(&desc->intf->dev,
--
2.17.0
reply other threads:[~2018-09-01 8:03 UTC|newest]
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