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From:   Pavel Skripkin <paskripkin@gmail.com>
To:     mchehab@kernel.org, jsagarribay@gmail.com
Cc:     linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
        Pavel Skripkin <paskripkin@gmail.com>, stable@vger.kernel.org
Subject: [PATCH] media: stkwebcam: fix memory leak in stk_camera_probe
Date:   Wed,  7 Jul 2021 20:54:30 +0300
Message-Id: <20210707175430.23204-1-paskripkin@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

My local syzbot instance hit memory leak in usb_set_configuration().
The problem was in unputted usb interface. In case of errors after
usb_get_intf() the reference should be putted to correclty free memory
allocated for this interface.

Fixes: ec16dae5453e ("V4L/DVB (7019): V4L: add support for Syntek DC1125 webcams")
Cc: stable@vger.kernel.org
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
---
 drivers/media/usb/stkwebcam/stk-webcam.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/media/usb/stkwebcam/stk-webcam.c b/drivers/media/usb/stkwebcam/stk-webcam.c
index a45d464427c4..0e231e576dc3 100644
--- a/drivers/media/usb/stkwebcam/stk-webcam.c
+++ b/drivers/media/usb/stkwebcam/stk-webcam.c
@@ -1346,7 +1346,7 @@ static int stk_camera_probe(struct usb_interface *interface,
 	if (!dev->isoc_ep) {
 		pr_err("Could not find isoc-in endpoint\n");
 		err = -ENODEV;
-		goto error;
+		goto error_put;
 	}
 	dev->vsettings.palette = V4L2_PIX_FMT_RGB565;
 	dev->vsettings.mode = MODE_VGA;
@@ -1359,10 +1359,12 @@ static int stk_camera_probe(struct usb_interface *interface,
 
 	err = stk_register_video_device(dev);
 	if (err)
-		goto error;
+		goto error_put;
 
 	return 0;
 
+error_put:
+	usb_put_intf(interface);
 error:
 	v4l2_ctrl_handler_free(hdl);
 	v4l2_device_unregister(&dev->v4l2_dev);
-- 
2.32.0