linux-kernel - [PATCH v4] media: usb: siano: Fix allocation of urbs

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Message-Id: <20240415-smatch-v4-1-8dce3d80b64a@chromium.org>
Date: Mon, 15 Apr 2024 12:48:13 +0000
From: Ricardo Ribalda <ribalda@...omium.org>
To: Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Yasunari Takiguchi <Yasunari.Takiguchi@...y.com>, 
 Jean-Christophe Trotin <jean-christophe.trotin@...s.st.com>, 
 Lars-Peter Clausen <lars@...afoo.de>, 
 Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: Hans Verkuil <hverkuil-cisco@...all.nl>, linux-media@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-input@...r.kernel.org, 
 Ricardo Ribalda <ribalda@...omium.org>
Subject: [PATCH v4] media: usb: siano: Fix allocation of urbs

USB urbs must be allocated with usb_alloc_urb. Quoting the manual

Only use this function (usb_init_urb) if you _really_ understand what you
are doing.

Fix the following smatch error:

drivers/media/usb/siano/smsusb.c:53:38: warning: array of flexible structures

Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
Changes in v4:
- Remove unneeded label free_urbs
- Link to v3: https://lore.kernel.org/r/20240415-smatch-v3-1-ed3f23f9d5ee@chromium.org

Changes in v3: Thanks Hans
- Remove unneeded NULL assignment
- Use the proper variable :)
- Link to v2: https://lore.kernel.org/r/20240415-smatch-v2-1-65215936d398@chromium.org

Changes in v2: Thanks Hans
- Only leave 1/6, the other ones are in another PR
- Fix the return tag and NULLify the urbs on return
- Link to v1: https://lore.kernel.org/r/20240410-smatch-v1-0-785d009a852b@chromium.org
---
 drivers/media/usb/siano/smsusb.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/media/usb/siano/smsusb.c b/drivers/media/usb/siano/smsusb.c
index 723510520d09..2c8179a84991 100644
--- a/drivers/media/usb/siano/smsusb.c
+++ b/drivers/media/usb/siano/smsusb.c
@@ -40,7 +40,7 @@ struct smsusb_urb_t {
 	struct smscore_buffer_t *cb;
 	struct smsusb_device_t *dev;
 
-	struct urb urb;
+	struct urb *urb;
 
 	/* For the bottom half */
 	struct work_struct wq;
@@ -160,7 +160,7 @@ static int smsusb_submit_urb(struct smsusb_device_t *dev,
 	}
 
 	usb_fill_bulk_urb(
-		&surb->urb,
+		surb->urb,
 		dev->udev,
 		usb_rcvbulkpipe(dev->udev, dev->in_ep),
 		surb->cb->p,
@@ -168,9 +168,9 @@ static int smsusb_submit_urb(struct smsusb_device_t *dev,
 		smsusb_onresponse,
 		surb
 	);
-	surb->urb.transfer_flags |= URB_FREE_BUFFER;
+	surb->urb->transfer_flags |= URB_FREE_BUFFER;
 
-	return usb_submit_urb(&surb->urb, GFP_ATOMIC);
+	return usb_submit_urb(surb->urb, GFP_ATOMIC);
 }
 
 static void smsusb_stop_streaming(struct smsusb_device_t *dev)
@@ -178,7 +178,7 @@ static void smsusb_stop_streaming(struct smsusb_device_t *dev)
 	int i;
 
 	for (i = 0; i < MAX_URBS; i++) {
-		usb_kill_urb(&dev->surbs[i].urb);
+		usb_kill_urb(dev->surbs[i].urb);
 		if (dev->surbs[i].wq.func)
 			cancel_work_sync(&dev->surbs[i].wq);
 
@@ -338,6 +338,8 @@ static void smsusb_term_device(struct usb_interface *intf)
 	struct smsusb_device_t *dev = usb_get_intfdata(intf);
 
 	if (dev) {
+		int i;
+
 		dev->state = SMSUSB_DISCONNECTED;
 
 		smsusb_stop_streaming(dev);
@@ -346,6 +348,9 @@ static void smsusb_term_device(struct usb_interface *intf)
 		if (dev->coredev)
 			smscore_unregister_device(dev->coredev);
 
+		for (i = 0; i < MAX_URBS; i++)
+			usb_free_urb(dev->surbs[i].urb);
+
 		pr_debug("device 0x%p destroyed\n", dev);
 		kfree(dev);
 	}
@@ -463,7 +468,9 @@ static int smsusb_init_device(struct usb_interface *intf, int board_id)
 	/* initialize urbs */
 	for (i = 0; i < MAX_URBS; i++) {
 		dev->surbs[i].dev = dev;
-		usb_init_urb(&dev->surbs[i].urb);
+		dev->surbs[i].urb = usb_alloc_urb(0, GFP_KERNEL);
+		if (!dev->surbs[i].urb)
+			goto err_unregister_device;
 	}
 
 	pr_debug("smsusb_start_streaming(...).\n");
@@ -486,6 +493,7 @@ static int smsusb_init_device(struct usb_interface *intf, int board_id)
 	return rc;
 
 err_unregister_device:
+	/* smsusb_term_device() frees any allocated urb. */
 	smsusb_term_device(intf);
 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 	media_device_unregister(mdev);

---
base-commit: 34d7bf1c8e59f5fbf438ee32c96389ebe41ca2e8
change-id: 20240410-smatch-8f235d50753d

Best regards,
-- 
Ricardo Ribalda <ribalda@...omium.org>