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usbnet: ipheth: fix potential null pointer dereference in ipheth_carrier_set

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commit 61c59355e0154a938b28710dfa6c1d8be2ddcefa upstream.

_dev_ is being dereferenced before it is null checked, hence there
is a potential null pointer dereference.

Fix this by moving the pointer dereference after _dev_ has been null
checked.

Addresses-Coverity-ID: 1462020
Fixes: bb1b40c7cb86 ("usbnet: ipheth: prevent TX queue timeouts when device not ready")
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gustavo A. R. Silva 2017-11-17 14:02:09 -06:00 committed by Greg Kroah-Hartman
parent f5bca75dc4
commit b41449d9be
1 changed files with 4 additions and 1 deletions
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5
drivers/net/usb/ipheth.c
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@ -290,12 +290,15 @@ static void ipheth_sndbulk_callback(struct urb *urb)
static int ipheth_carrier_set(struct ipheth_device *dev)
{
struct usb_device *udev = dev->udev;
struct usb_device *udev;
int retval;
if (!dev)
return 0;
if (!dev->confirmed_pairing)
return 0;
udev = dev->udev;
retval = usb_control_msg(udev,
usb_rcvctrlpipe(udev, IPHETH_CTRL_ENDP),
IPHETH_CMD_CARRIER_CHECK, /* request */