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NFC: pn533: fix bulk-message timeout

Message ID 20200113172358.30973-1-johan@kernel.org
State New
Headers show
Series NFC: pn533: fix bulk-message timeout | expand

Commit Message

Johan Hovold Jan. 13, 2020, 5:23 p.m. UTC
The driver was doing a synchronous uninterruptible bulk-transfer without
using a timeout. This could lead to the driver hanging on probe due to a
malfunctioning (or malicious) device until the device is physically
disconnected. While sleeping in probe the driver prevents other devices
connected to the same hub from being added to (or removed from) the bus.

An arbitrary limit of five seconds should be more than enough.

Fixes: dbafc28955fa ("NFC: pn533: don't send USB data off of the stack")
Cc: stable <stable@vger.kernel.org>     # 4.18
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/nfc/pn533/usb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/nfc/pn533/usb.c b/drivers/nfc/pn533/usb.c
index 4590fbf82dc2..f5bb7ace2ff5 100644
--- a/drivers/nfc/pn533/usb.c
+++ b/drivers/nfc/pn533/usb.c
@@ -391,7 +391,7 @@  static int pn533_acr122_poweron_rdr(struct pn533_usb_phy *phy)
 		       cmd, sizeof(cmd), false);
 
 	rc = usb_bulk_msg(phy->udev, phy->out_urb->pipe, buffer, sizeof(cmd),
-			  &transferred, 0);
+			  &transferred, 5000);
 	kfree(buffer);
 	if (rc || (transferred != sizeof(cmd))) {
 		nfc_err(&phy->udev->dev,