[PATCH 4.19 080/131] usb: gadget: udc: Potential Oops in error handling code

Sasha Levin
2020-06-29T20:03:37Z

From: Dan Carpenter <dan.carpenter@oracle.com>

[ 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>
---
drivers/usb/gadget/udc/mv_udc_core.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/udc/mv_udc_core.c b/drivers/usb/gadget/udc/mv_udc_core.c
index 95f52232493b2..83e98b59910ec 100644
--- 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:
--
2.25.1