netfilter: nfnetlink_queue: do not allow to set unsupported flag bits

Allow setting of only supported flag bits in queue->flags.

Signed-off-by: Krishna Kumar <krkumar2@in.ibm.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/net/netfilter/nfnetlink_queue_core.c b/net/netfilter/nfnetlink_queue_core.c
index a0b64920039d..c0496a55ad0c 100644
--- a/net/netfilter/nfnetlink_queue_core.c
+++ b/net/netfilter/nfnetlink_queue_core.c
@@ -910,6 +910,11 @@ nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
                 flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS]));
                 mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK]));
 
+                if (flags >= NFQA_CFG_F_MAX) {
+                        ret = -EOPNOTSUPP;
+                        goto err_out_unlock;
+                }
+
                 spin_lock_bh(&queue->lock);
                 queue->flags &= ~mask;
                 queue->flags |= flags & mask;