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packet: validate address length
[ Upstream commit 99137b7888
]
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>
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parent
65b3480236
commit
9eee85ed84
1 changed files with 4 additions and 0 deletions
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@ -2665,6 +2665,8 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
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proto = saddr->sll_protocol;
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addr = saddr->sll_addr;
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dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex);
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if (addr && dev && saddr->sll_halen < dev->addr_len)
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goto out;
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}
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err = -ENXIO;
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@ -2863,6 +2865,8 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
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proto = saddr->sll_protocol;
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addr = saddr->sll_addr;
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dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex);
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if (addr && dev && saddr->sll_halen < dev->addr_len)
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goto out;
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}
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err = -ENXIO;
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