From bc3d2e9cfdc5c1b7e5ed34eb5279e47d462b4d5c Mon Sep 17 00:00:00 2001
From: Ori Nimron <orinimron123@gmail.com>
Date: Fri, 20 Sep 2019 09:35:49 +0200
Subject: [PATCH] nfc: enforce CAP_NET_RAW for raw sockets

commit 3a359798b176183ef09efb7a3dc59abad1cc7104 upstream.

When creating a raw AF_NFC socket, CAP_NET_RAW needs to be checked
first.

Signed-off-by: Ori Nimron <orinimron123@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 net/nfc/llcp_sock.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/net/nfc/llcp_sock.c b/net/nfc/llcp_sock.c
index 51f077a92fa92..3e2982db97e56 100644
--- a/net/nfc/llcp_sock.c
+++ b/net/nfc/llcp_sock.c
@@ -1004,10 +1004,13 @@ static int llcp_sock_create(struct net *net, struct socket *sock,
 	    sock->type != SOCK_RAW)
 		return -ESOCKTNOSUPPORT;
 
-	if (sock->type == SOCK_RAW)
+	if (sock->type == SOCK_RAW) {
+		if (!capable(CAP_NET_RAW))
+			return -EPERM;
 		sock->ops = &llcp_rawsock_ops;
-	else
+	} else {
 		sock->ops = &llcp_sock_ops;
+	}
 
 	sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC);
 	if (sk == NULL)