netlink: validate addr_len on bind

Otherwise an out of bounds read could happen.

Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 9ee52b6a12dd..c0353d55d56f 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -669,6 +669,9 @@ static int netlink_bind(struct socket *sock, struct sockaddr *addr,
         struct sockaddr_nl *nladdr = (struct sockaddr_nl *)addr;
         int err;
 
+        if (addr_len < sizeof(struct sockaddr_nl))
+                return -EINVAL;
+
         if (nladdr->nl_family != AF_NETLINK)
                 return -EINVAL;