linux-kernel - [PATCH 4.9 085/103] USB: CDC: fix sanity checks in CDC union parser

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Message-Id: <20190822171732.610903284@linuxfoundation.org>
Date:   Thu, 22 Aug 2019 10:19:13 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        syzbot+45a53506b65321c1fe91@...kaller.appspotmail.com,
        Oliver Neukum <oneukum@...e.com>
Subject: [PATCH 4.9 085/103] USB: CDC: fix sanity checks in CDC union parser

From: Oliver Neukum <oneukum@...e.com>

commit 54364278fb3cabdea51d6398b07c87415065b3fc upstream.

A few checks checked for the size of the pointer to a structure
instead of the structure itself. Copy & paste issue presumably.

Fixes: e4c6fb7794982 ("usbnet: move the CDC parser into USB core")
Cc: stable <stable@...r.kernel.org>
Reported-by: syzbot+45a53506b65321c1fe91@...kaller.appspotmail.com
Signed-off-by: Oliver Neukum <oneukum@...e.com>
Link: https://lore.kernel.org/r/20190813093541.18889-1-oneukum@suse.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/core/message.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -2142,14 +2142,14 @@ int cdc_parse_cdc_header(struct usb_cdc_
 				(struct usb_cdc_dmm_desc *)buffer;
 			break;
 		case USB_CDC_MDLM_TYPE:
-			if (elength < sizeof(struct usb_cdc_mdlm_desc *))
+			if (elength < sizeof(struct usb_cdc_mdlm_desc))
 				goto next_desc;
 			if (desc)
 				return -EINVAL;
 			desc = (struct usb_cdc_mdlm_desc *)buffer;
 			break;
 		case USB_CDC_MDLM_DETAIL_TYPE:
-			if (elength < sizeof(struct usb_cdc_mdlm_detail_desc *))
+			if (elength < sizeof(struct usb_cdc_mdlm_detail_desc))
 				goto next_desc;
 			if (detail)
 				return -EINVAL;