linux-kernel - [PATCH] media: uvcvideo: Fix a memory leak in error handling code in 'uvc_gpio

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Message-Id: <4c96691f21293dea1c3584f80a58138e2a2f9219.1630736273.git.christophe.jaillet@wanadoo.fr>
Date:   Sat,  4 Sep 2021 08:20:18 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     laurent.pinchart@...asonboard.com, mchehab@...nel.org,
        ribalda@...omium.org
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] media: uvcvideo: Fix a memory leak in error handling code in 'uvc_gpio_parse()'

Memory allocated in 'uvc_alloc_entity()' should be freed if an error
occurs after it.

Reorder the code in order to avoid the leak.

Fixes: 2886477ff987 ("media: uvcvideo: Implement UVC_EXT_GPIO_UNIT")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/media/usb/uvc/uvc_driver.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index b1b055784f8d..a4c45424ba7e 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -1533,10 +1533,6 @@ static int uvc_gpio_parse(struct uvc_device *dev)
 	if (IS_ERR_OR_NULL(gpio_privacy))
 		return PTR_ERR_OR_ZERO(gpio_privacy);
 
-	unit = uvc_alloc_entity(UVC_EXT_GPIO_UNIT, UVC_EXT_GPIO_UNIT_ID, 0, 1);
-	if (!unit)
-		return -ENOMEM;
-
 	irq = gpiod_to_irq(gpio_privacy);
 	if (irq < 0) {
 		if (irq != EPROBE_DEFER)
@@ -1545,6 +1541,10 @@ static int uvc_gpio_parse(struct uvc_device *dev)
 		return irq;
 	}
 
+	unit = uvc_alloc_entity(UVC_EXT_GPIO_UNIT, UVC_EXT_GPIO_UNIT_ID, 0, 1);
+	if (!unit)
+		return -ENOMEM;
+
 	unit->gpio.gpio_privacy = gpio_privacy;
 	unit->gpio.irq = irq;
 	unit->gpio.bControlSize = 1;
-- 
2.30.2