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selinux: check length properly in SCTP bind hook 

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: Qian Cai <cai@gmx.us>
Fixes: d452930fd3 ("selinux: Add SCTP support")
Cc: <stable@vger.kernel.org> # 4.17+
Cc: Richard Haines <richard_c_haines@btinternet.com>
Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
Tested-by: Qian Cai <cai@gmx.us>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Ondrej Mosnacek 2018-11-13 16:16:08 +01:00 committed by Paul Moore
parent 4458bba097
commit c138325fb8
1 changed files with 3 additions and 0 deletions
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3
security/selinux/hooks.c
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@ -5318,6 +5318,9 @@ static int selinux_sctp_bind_connect(struct sock *sk, int optname,
addr_buf = address;
while (walk_size < addrlen) {
if (walk_size + sizeof(sa_family_t) > addrlen)
return -EINVAL;
addr = addr_buf;
switch (addr->sa_family) {
case AF_UNSPEC: