packet: tpacket_snd(): fix signed/unsigned comparison

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[ Upstream commit dbd46ab412 ]

tpacket_fill_skb() can return a negative value (-errno) which
is stored in tp_len variable. In that case the following
condition will be (but shouldn't be) true:

tp_len > dev->mtu + dev->hard_header_len

as dev->mtu and dev->hard_header_len are both unsigned.

That may lead to just returning an incorrect EMSGSIZE errno
to the user.

Fixes: 52f1454f62 ("packet: allow to transmit +4 byte in TX_RING slot for VLAN case")
Signed-off-by: Alexander Drozdov <al.drozdov@gmail.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Alexander Drozdov 2015-07-28 13:57:01 +03:00 • committed by Greg Kroah-Hartman

parent d339d03860

commit 2ef3d434d3

1 changed files with 2 additions and 1 deletions

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net/packet/af_packet.c

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