During probe, in the device tree case, the data pointer associated to a
compatible is dereferenced. However, not all the compatibles are
associated to a private data pointer.

The generic-xhci and the xhci-platform don't need them, this patch adds a
test on the data pointer before accessing it, avoiding a kernel crash.

Fixes: 4efb2f694114 ("usb: host: xhci-plat: add struct xhci_plat_priv")
Cc: sta...@vger.kernel.org
Signed-off-by: Gregory CLEMENT <gregory.clem...@free-electrons.com>
---
 drivers/usb/host/xhci-plat.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 770b6b088797..d39d6bf1d090 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -184,7 +184,8 @@ static int xhci_plat_probe(struct platform_device *pdev)
                struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
 
                /* Just copy data for now */
-               *priv = *priv_match;
+               if (priv_match)
+                       *priv = *priv_match;
        }
 
        if (xhci_plat_type_is(hcd, XHCI_PLAT_TYPE_MARVELL_ARMADA)) {
-- 
2.5.0

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