selinux: check length properly in SCTP bind hook
commit c138325f upstream. selinux_sctp_bind_connect() must verify if the address buffer has sufficient length before accessing the 'sa_family' field. See __sctp_connect() for a similar check. The length of the whole address ('len') is already checked in the callees. Reported-by: NQian Cai <cai@gmx.us> Fixes: d452930f ("selinux: Add SCTP support") Cc: <stable@vger.kernel.org> # 4.17+ Cc: Richard Haines <richard_c_haines@btinternet.com> Signed-off-by: NOndrej Mosnacek <omosnace@redhat.com> Tested-by: NQian Cai <cai@gmx.us> Signed-off-by: NPaul Moore <paul@paul-moore.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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