| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.9 16/71] packet: validate address length | Date | Mon, 7 Jan 2019 13:32:45 +0100 |
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4.9-stable review patch. If anyone has any objections, please let me know.
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From: Willem de Bruijn <willemb@google.com>
[ Upstream commit 99137b7888f4058087895d035d81c6b2d31015c5 ]
Packet sockets with SOCK_DGRAM may pass an address for use in dev_hard_header. Ensure that it is of sufficient length.
Reported-by: syzbot <syzkaller@googlegroups.com> Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- net/packet/af_packet.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -2662,6 +2662,8 @@ static int tpacket_snd(struct packet_soc proto = saddr->sll_protocol; addr = saddr->sll_addr; dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex); + if (addr && dev && saddr->sll_halen < dev->addr_len) + goto out; } err = -ENXIO; @@ -2859,6 +2861,8 @@ static int packet_snd(struct socket *soc proto = saddr->sll_protocol; addr = saddr->sll_addr; dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex); + if (addr && dev && saddr->sll_halen < dev->addr_len) + goto out; } err = -ENXIO;
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