usb: gadget: udc: Potential Oops in error handling code

[ Upstream commit e55f3c37cb8d31c7e301f46396b2ac6a19eb3a7c ]

If this is in "transceiver" mode the the ->qwork isn't required and is
a NULL pointer.  This can lead to a NULL dereference when we call
destroy_workqueue(udc->qwork).

Fixes: 3517c31a8ece ("usb: gadget: mv_udc: use devm_xxx for probe")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/usb/gadget/udc/mv_udc_core.c b/drivers/usb/gadget/udc/mv_udc_core.c
index cafde05..80a1b52 100644 (file)
--- a/drivers/usb/gadget/udc/mv_udc_core.c
+++ b/drivers/usb/gadget/udc/mv_udc_core.c
@@ -2313,7 +2313,8 @@ static int mv_udc_probe(struct platform_device *pdev)
        return 0;
 
 err_create_workqueue:
-       destroy_workqueue(udc->qwork);
+       if (udc->qwork)
+               destroy_workqueue(udc->qwork);
 err_destroy_dma:
        dma_pool_destroy(udc->dtd_pool);
 err_free_dma: