linux-kernel - [PATCH 4.19 05/34] sr9700: sanity check for packet length

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Message-Id: <20220228172208.942887061@linuxfoundation.org>
Date:   Mon, 28 Feb 2022 18:24:11 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Oliver Neukum <oneukum@...e.com>,
        Grant Grundler <grundler@...omium.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.19 05/34] sr9700: sanity check for packet length

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

commit e9da0b56fe27206b49f39805f7dcda8a89379062 upstream.

A malicious device can leak heap data to user space
providing bogus frame lengths. Introduce a sanity check.

Signed-off-by: Oliver Neukum <oneukum@...e.com>
Reviewed-by: Grant Grundler <grundler@...omium.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/usb/sr9700.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/usb/sr9700.c
+++ b/drivers/net/usb/sr9700.c
@@ -410,7 +410,7 @@ static int sr9700_rx_fixup(struct usbnet
 		/* ignore the CRC length */
 		len = (skb->data[1] | (skb->data[2] << 8)) - 4;
 
-		if (len > ETH_FRAME_LEN)
+		if (len > ETH_FRAME_LEN || len > skb->len)
 			return 0;
 
 		/* the last packet of current skb */