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Date: Mon, 28 Feb 2022 18:23:09 +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 5.16 027/164] 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 @@ -413,7 +413,7 @@ 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 */
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