net: xilinx_emaclite: fix receive buffer overflow

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[ Upstream commit cd22455364 ]

xilinx_emaclite looks at the received data to try to determine the
Ethernet packet length but does not properly clamp it if
proto_type == ETH_P_IP or 1500 < proto_type <= 1518, causing a buffer
overflow and a panic via skb_panic() as the length exceeds the allocated
skb size.

Fix those cases.

Also add an additional unconditional check with WARN_ON() at the end.

Signed-off-by: Anssi Hannula <anssi.hannula@bitwise.fi>
Fixes: bb81b2ddfa ("net: add Xilinx emac lite device driver")
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Anssi Hannula 2017-05-23 21:53:29 -04:00 • committed by Greg Kroah-Hartman

parent bff3001afa

commit a2901d01a6

1 changed files with 7 additions and 3 deletions

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drivers/net/ethernet/xilinx/xilinx_emaclite.c

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