1 files changed, 7 insertions, 0 deletions

diff --git a/net/compat.c b/net/compat.c
index 94d3d5e97883..f7bd286a8280 100644
--- a/net/compat.c
+++ b/net/compat.c
@@ -49,6 +49,13 @@ ssize_t get_compat_msghdr(struct msghdr *kmsg,
             __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
             __get_user(kmsg->msg_flags, &umsg->msg_flags))
                 return -EFAULT;
+
+        if (!uaddr)
+                kmsg->msg_namelen = 0;
+
+        if (kmsg->msg_namelen < 0)
+                return -EINVAL;
+
         if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
                 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
         kmsg->msg_control = compat_ptr(tmp3);