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xfrm: check id proto in validate_tmpl()

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syzbot reported a kernel warning in xfrm_state_fini(), which
indicates that we have entries left in the list
net->xfrm.state_all whose proto is zero. And
xfrm_id_proto_match() doesn't consider them as a match with
IPSEC_PROTO_ANY in this case.

Proto with value 0 is probably not a valid value, at least
verify_newsa_info() doesn't consider it valid either.

This patch fixes it by checking the proto value in
validate_tmpl() and rejecting invalid ones, like what iproute2
does in xfrm_xfrmproto_getbyname().

Reported-by: syzbot <syzkaller@googlegroups.com>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Cong Wang 2017-11-27 11:15:16 -08:00 committed by Steffen Klassert
parent d51aae68b1
commit 6a53b75932
1 changed files with 15 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

15
net/xfrm/xfrm_user.c
View file

@ -1445,6 +1445,21 @@ static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
default:
return -EINVAL;
}
switch (ut[i].id.proto) {
case IPPROTO_AH:
case IPPROTO_ESP:
case IPPROTO_COMP:
#if IS_ENABLED(CONFIG_IPV6)
case IPPROTO_ROUTING:
case IPPROTO_DSTOPTS:
#endif
case IPSEC_PROTO_ANY:
break;
default:
return -EINVAL;
}
}
return 0;