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From: Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>,
	"linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>
Cc: John Youn <John.Youn@synopsys.com>,
	Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>
Subject: [PATCH v2] usb: dwc2: host: Fix dereference issue in DDMA completion flow.
Date: Tue, 9 Apr 2024 12:27:54 +0000	[thread overview]
Message-ID: <cc826d3ef53c934d8e6d98870f17f3cdc3d2755d.1712665387.git.Minas.Harutyunyan@synopsys.com> (raw)

Fixed variable dereference issue in DDMA completion flow.

Fixes: b258e4268850 ("usb: dwc2: host: Fix ISOC flow in DDMA mode")
CC: stable@vger.kernel.org
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/linux-usb/2024040834-ethically-rumble-701f@gregkh/T/#m4c4b83bef0ebb4b67fe2e0a7d6466cbb6f416e39
Signed-off-by: Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>
---
 Changes in v2:
 - Added "Reported-by:" tag

 drivers/usb/dwc2/hcd_ddma.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc2/hcd_ddma.c b/drivers/usb/dwc2/hcd_ddma.c
index 79582b102c7e..994a78ad084b 100644
--- a/drivers/usb/dwc2/hcd_ddma.c
+++ b/drivers/usb/dwc2/hcd_ddma.c
@@ -867,13 +867,15 @@ static int dwc2_cmpl_host_isoc_dma_desc(struct dwc2_hsotg *hsotg,
 	struct dwc2_dma_desc *dma_desc;
 	struct dwc2_hcd_iso_packet_desc *frame_desc;
 	u16 frame_desc_idx;
-	struct urb *usb_urb = qtd->urb->priv;
+	struct urb *usb_urb;
 	u16 remain = 0;
 	int rc = 0;
 
 	if (!qtd->urb)
 		return -EINVAL;
 
+	usb_urb = qtd->urb->priv;
+
 	dma_sync_single_for_cpu(hsotg->dev, qh->desc_list_dma + (idx *
 				sizeof(struct dwc2_dma_desc)),
 				sizeof(struct dwc2_dma_desc),

base-commit: d464dac47260a33add5a206fd3289ec1216e8435
-- 
2.41.0

                 reply	other threads:[~2024-04-09 12:28 UTC|newest]

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