linux-kernel - [PATCH][next] media: uvcvideo: Fix memory leak of object map on error exit path

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Message-Id: <20210917114930.47261-1-colin.king@canonical.com>
Date:   Fri, 17 Sep 2021 12:49:30 +0100
From:   Colin King <colin.king@...onical.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Ricardo Ribalda <ribalda@...omium.org>,
        linux-media@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] media: uvcvideo: Fix memory leak of object map on error exit path

From: Colin Ian King <colin.king@...onical.com>

Currently when the allocation of map->name fails the error exit path
does not kfree the previously allocated object map. Fix this by
setting ret to -ENOMEM and taking the free_map exit error path to
ensure map is kfree'd.

Addresses-Coverity: ("Resource leak")
Fixes: 07adedb5c606 ("media: uvcvideo: Use control names from framework")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/media/usb/uvc/uvc_v4l2.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index f4e4aff8ddf7..711556d13d03 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -44,8 +44,10 @@ static int uvc_ioctl_ctrl_map(struct uvc_video_chain *chain,
 	if (v4l2_ctrl_get_name(map->id) == NULL) {
 		map->name = kmemdup(xmap->name, sizeof(xmap->name),
 				    GFP_KERNEL);
-		if (!map->name)
-			return -ENOMEM;
+		if (!map->name) {
+			ret = -ENOMEM;
+			goto free_map;
+		}
 	}
 	memcpy(map->entity, xmap->entity, sizeof(map->entity));
 	map->selector = xmap->selector;
-- 
2.32.0