sctp: Make sure N * sizeof(union sctp_addr) does not overflow.
David S. Miller authored

As noticed by Gabriel Campana, the kmalloc() length arg
passed in by sctp_getsockopt_local_addrs_old() can overflow
if ->addr_num is large enough.

Therefore, enforce an appropriate limit.
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
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