staging: dwc2: fix potential null pointer access

We were testing hsotg pointer for null after we had already
dereferenced it

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/dwc2/hcd_ddma.c b/drivers/staging/dwc2/hcd_ddma.c
index ab88f5069183bccd98c2fac61b22bc105b3edacc..d2180b275f7aa00863180533c1b4c5ecc6435b5a 100644 (file)
--- a/drivers/staging/dwc2/hcd_ddma.c
+++ b/drivers/staging/dwc2/hcd_ddma.c
@@ -217,18 +217,18 @@ static void dwc2_update_frame_list(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh,
        struct dwc2_host_chan *chan;
        u16 i, j, inc;
 
-       if (!qh->channel) {
-               dev_err(hsotg->dev, "qh->channel = %p", qh->channel);
+       if (!hsotg) {
+               pr_err("hsotg = %p", hsotg);
                return;
        }
 
-       if (!hsotg) {
-               dev_err(hsotg->dev, "------hsotg = %p", hsotg);
+       if (!qh->channel) {
+               dev_err(hsotg->dev, "qh->channel = %p", qh->channel);
                return;
        }
 
        if (!hsotg->frame_list) {
-               dev_err(hsotg->dev, "-------hsotg->frame_list = %p",
+               dev_err(hsotg->dev, "hsotg->frame_list = %p",
                        hsotg->frame_list);
                return;
        }