linux-kernel - [PATCH] media: uvcvideo: Fix OOB read

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Message-Id: <20230717-uvc-oob-v1-1-f5b9b4aba3b4@chromium.org>
Date:   Wed, 19 Jul 2023 12:05:29 +0000
From:   Ricardo Ribalda <ribalda@...omium.org>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...nel.org, Ricardo Ribalda <ribalda@...omium.org>
Subject: [PATCH] media: uvcvideo: Fix OOB read

If the index provided by the user is bigger than 32, we might do an out
of bound read.

CC: stable@...nel.org
Fixes: 40140eda661e ("media: uvcvideo: Implement mask for V4L2_CTRL_TYPE_MENU")
Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
Avoid reading index >= 31
---
 drivers/media/usb/uvc/uvc_ctrl.c | 3 +++
 drivers/media/usb/uvc/uvcvideo.h | 1 +
 2 files changed, 4 insertions(+)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index 5e9d3da862dd..5e3af66a2223 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1402,6 +1402,9 @@ int uvc_query_v4l2_menu(struct uvc_video_chain *chain,
 	query_menu->id = id;
 	query_menu->index = index;
 
+	if (index >= UVC_MAX_MENU)
+		return -EINVAL;
+
 	ret = mutex_lock_interruptible(&chain->ctrl_mutex);
 	if (ret < 0)
 		return -ERESTARTSYS;
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index 6fb0a78b1b00..139608f83499 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -101,6 +101,7 @@ struct uvc_control_info {
 	u32 flags;
 };
 
+#define UVC_MAX_MENU 32
 struct uvc_control_mapping {
 	struct list_head list;
 	struct list_head ev_subs;

---
base-commit: fdf0eaf11452d72945af31804e2a1048ee1b574c
change-id: 20230717-uvc-oob-4b0148a00417

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