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From: Dan Carpenter <dan.carpenter@oracle.com>
To: Felipe Balbi <balbi@kernel.org>, Chao Xie <chao.xie@marvell.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-usb@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [PATCH] usb: gadget: udc: Potential Oops in error handling code
Date: Mon, 15 Jun 2020 11:27:19 +0000	[thread overview]
Message-ID: <20200615112719.GA1207669@mwanda> (raw)

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>
---
 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 cafde053788bb..80a1b52c656e0 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:
-- 
2.26.2

                 reply	other threads:[~2020-06-15 11:27 UTC|newest]

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