linux-kernel - [PATCH v3] media: uvcvideo: Fix memory leak in uvc_gpio

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Message-Id: <20220717133847.245703-1-jose.exposito89@gmail.com>
Date:   Sun, 17 Jul 2022 15:38:47 +0200
From:   José Expósito <jose.exposito89@...il.com>
To:     laurent.pinchart@...asonboard.com
Cc:     mchehab@...nel.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, ribalda@...omium.org,
        José Expósito <jose.exposito89@...il.com>
Subject: [PATCH v3] media: uvcvideo: Fix memory leak in uvc_gpio_parse

Previously the unit buffer was allocated before checking the IRQ for
privacy GPIO.
In case of error, the unit buffer was leaked.

Allocate the unit buffer after the IRQ to avoid it.

Addresses-Coverity-ID: 1474639 ("Resource leak")
Fixes: 2886477ff987 ("media: uvcvideo: Implement UVC_EXT_GPIO_UNIT")
Reviewed-by: Ricardo Ribalda <ribalda@...omium.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: José Expósito <jose.exposito89@...il.com>

---

v2: Add Fixes and Reviewed-by Ricardo Ribalda tags
v3: Add Reviewed-by Laurent Pinchart
---
 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 7c007426e082..9e83e2002710 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;
-- 
2.25.1