usb: host: xhci-plat: fix NULL pointer in probe for device tree case

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: 4efb2f6 ("usb: host: xhci-plat: add struct xhci_plat_priv")
Cc: [email protected]
Signed-off-by: Gregory CLEMENT <[email protected]>
Signed-off-by: Mathias Nyman <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: gclement

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)) {