4.9-stable review patch. If anyone has any objections, please let me know.
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From: Colin Ian King colin.king@canonical.com
commit df3334c223a033f562645712e832ca4cbb326bbf upstream.
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
--- drivers/usb/usbip/vudc_sysfs.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
--- a/drivers/usb/usbip/vudc_sysfs.c +++ b/drivers/usb/usbip/vudc_sysfs.c @@ -117,10 +117,14 @@ static ssize_t store_sockfd(struct devic 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; }