check if received netlink messages are really from the kernel (pid==0)

diff --git a/libipq/libipq.c b/libipq/libipq.c
index 709c8a2171f2c77d49b82ad298641384826d3d6e..a25ad4ceccfcf9670fdb5d0496f29de2dc26ca37 100644 (file)
--- a/libipq/libipq.c
+++ b/libipq/libipq.c
@@ -171,6 +171,10 @@ static ssize_t ipq_netlink_recvfrom(const struct ipq_handle *h,
                ipq_errno = IPQ_ERR_RECV;
                return -1;
        }
+       if (h->peer.nl_pid != 0) {
+               ipq_errno = IPQ_ERR_RECV;
+               return -1;
+       }
        if (status == 0) {
                ipq_errno = IPQ_ERR_NLEOF;
                return -1;