netlink: test for all flags of the NLM_F_DUMP composite

Due to NLM_F_DUMP is composed of two bits, NLM_F_ROOT | NLM_F_MATCH,
when doing "if (x & NLM_F_DUMP)", it tests for _either_ of the bits
being set. Because NLM_F_MATCH's value overlaps with NLM_F_EXCL,
non-dump requests with NLM_F_EXCL set are mistaken as dump requests.

Substitute the condition to test for _all_ bits being set.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 750db57..a5f7535 100644 (file)
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1820,7 +1820,7 @@ static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
        if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
                return -EPERM;
 
-       if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
+       if (kind == 2 && (nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP) {
                struct sock *rtnl;
                rtnl_dumpit_func dumpit;
 

diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index 2ada171..2746c1f 100644 (file)
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -858,7 +858,7 @@ static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
            nlmsg_len(nlh) < hdrlen)
                return -EINVAL;
 
-       if (nlh->nlmsg_flags & NLM_F_DUMP) {
+       if ((nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP) {
                if (nlmsg_attrlen(nlh, hdrlen)) {
                        struct nlattr *attr;
 

diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 0cdba50..7461402 100644 (file)
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -928,7 +928,7 @@ ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
        u16 zone;
        int err;
 
-       if (nlh->nlmsg_flags & NLM_F_DUMP)
+       if ((nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP)
                return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
                                          ctnetlink_done);
 
@@ -1790,7 +1790,7 @@ ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
        u16 zone;
        int err;
 
-       if (nlh->nlmsg_flags & NLM_F_DUMP) {
+       if ((nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP) {
                return netlink_dump_start(ctnl, skb, nlh,
                                          ctnetlink_exp_dump_table,
                                          ctnetlink_exp_done);

diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index 1781d99..f83cb37 100644 (file)
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -519,7 +519,7 @@ static int genl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
            security_netlink_recv(skb, CAP_NET_ADMIN))
                return -EPERM;
 
-       if (nlh->nlmsg_flags & NLM_F_DUMP) {
+       if ((nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP) {
                if (ops->dumpit == NULL)
                        return -EOPNOTSUPP;
 

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 8eb8895..6a8da81 100644 (file)
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -2187,7 +2187,7 @@ static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 
        if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
             type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
-           (nlh->nlmsg_flags & NLM_F_DUMP)) {
+           (nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP) {
                if (link->dump == NULL)
                        return -EINVAL;