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authorColin Ian King <colin.king@canonical.com>2018-02-22 17:39:17 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-03-09 10:01:07 -0800
commitdf3334c223a033f562645712e832ca4cbb326bbf (patch)
treede18c6cecdacf6fbb8b4e69f3f2ffab94049046d /drivers/usb/usbip
parent191edc5e2e515aab1075a3f0ef23599e80be5f59 (diff)
downloadlinux-df3334c223a033f562645712e832ca4cbb326bbf.tar.bz2
usbip: vudc: fix null pointer dereference on udc->lock
Currently the driver attempts to spin lock on udc->lock before a NULL pointer check is performed on udc, hence there is a potential null pointer dereference on udc->lock. Fix this by moving the null check on udc before the lock occurs. Fixes: ea6873a45a22 ("usbip: vudc: Add SysFS infrastructure for VUDC") Signed-off-by: Colin Ian King <colin.king@canonical.com> Acked-by: Shuah Khan <shuahkh@osg.samsung.com> Reviewed-by: Krzysztof Opasiak <k.opasiak@samsung.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/usbip')
-rw-r--r--drivers/usb/usbip/vudc_sysfs.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/usb/usbip/vudc_sysfs.c b/drivers/usb/usbip/vudc_sysfs.c
index d86f72bbbb91..6dcd3ff655c3 100644
--- a/drivers/usb/usbip/vudc_sysfs.c
+++ b/drivers/usb/usbip/vudc_sysfs.c
@@ -105,10 +105,14 @@ static ssize_t usbip_sockfd_store(struct device *dev, struct device_attribute *a
if (rv != 0)
return -EINVAL;
+ if (!udc) {
+ dev_err(dev, "no device");
+ return -ENODEV;
+ }
spin_lock_irqsave(&udc->lock, flags);
/* Don't export what we don't have */
- if (!udc || !udc->driver || !udc->pullup) {
- dev_err(dev, "no device or gadget not bound");
+ if (!udc->driver || !udc->pullup) {
+ dev_err(dev, "gadget not bound");
ret = -ENODEV;
goto unlock;
}