selinux: initialize proto variable in selinux_ip_postroute_compat()
authorTom Rix <trix@redhat.com>
Fri, 24 Dec 2021 15:07:39 +0000 (07:07 -0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 5 Jan 2022 11:40:30 +0000 (12:40 +0100)
commit4833ad4908a1dff196946b4fd96cb5fe74a8621f
treede7219d0b553122f1236ae5e9e1fcadc496a6bb9
parentec941a2277a1db086a55daac96bd1ae77e41b34c
selinux: initialize proto variable in selinux_ip_postroute_compat()

commit 732bc2ff080c447f8524f40c970c481f5da6eed3 upstream.

Clang static analysis reports this warning

hooks.c:5765:6: warning: 4th function call argument is an uninitialized
                value
        if (selinux_xfrm_postroute_last(sksec->sid, skb, &ad, proto))
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

selinux_parse_skb() can return ok without setting proto.  The later call
to selinux_xfrm_postroute_last() does an early check of proto and can
return ok if the garbage proto value matches.  So initialize proto.

Cc: stable@vger.kernel.org
Fixes: eef9b41622f2 ("selinux: cleanup selinux_xfrm_sock_rcv_skb() and selinux_xfrm_postroute_last()")
Signed-off-by: Tom Rix <trix@redhat.com>
[PM: typo/spelling and checkpatch.pl description fixes]
Signed-off-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
security/selinux/hooks.c