net: usb: lan78xx: Limit packet length to skb->len

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[ Upstream commit 7f247f5a2c ]

Packet length retrieved from descriptor may be larger than
the actual socket buffer length. In such case the cloned
skb passed up the network stack will leak kernel memory contents.

Additionally prevent integer underflow when size is less than
ETH_FCS_LEN.

Fixes: 55d7de9de6 ("Microchip's LAN7800 family USB 2/3 to 10/100/1000 Ethernet device driver")
Signed-off-by: Szymon Heidrich <szymon.heidrich@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Szymon Heidrich 2023-03-18 10:25:52 +01:00 • committed by Greg Kroah-Hartman

parent 514dc3d0f1

commit 44b9ed7336

1 changed files with 17 additions and 1 deletions

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18

drivers/net/usb/lan78xx.c

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