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Date: Tue, 1 Mar 2022 15:13:20 -0500 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Oliver Neukum <oneukum@...e.com>, Grant Grundler <grundler@...omium.org>, "David S . Miller" <davem@...emloft.net>, Sasha Levin <sashal@...nel.org>, kuba@...nel.org, jgg@...pe.ca, arnd@...db.de, linux-usb@...r.kernel.org, netdev@...r.kernel.org Subject: [PATCH AUTOSEL 5.16 15/28] sr9700: sanity check for packet length From: Oliver Neukum <oneukum@...e.com> [ Upstream commit e9da0b56fe27206b49f39805f7dcda8a89379062 ] 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: Sasha Levin <sashal@...nel.org> --- drivers/net/usb/sr9700.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/usb/sr9700.c b/drivers/net/usb/sr9700.c index b658510cc9a42..5a53e63d33a60 100644 --- a/drivers/net/usb/sr9700.c +++ b/drivers/net/usb/sr9700.c @@ -413,7 +413,7 @@ static int sr9700_rx_fixup(struct usbnet *dev, struct sk_buff *skb) /* 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 */ -- 2.34.1
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