From: Qingyu Li <ieatmuttonchuan@gmail.com>
Date: Mon, 10 Aug 2020 09:51:00 +0800
Subject: net/nfc/rawsock.c: add CAP_NET_RAW check.
Git-commit: 26896f01467a28651f7a536143fe5ac8449d4041
Patch-mainline: 5.9-rc1
References: networking-stable-20_08_15 CVE-2020-26088 bsc#1176990

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

Signed-off-by: Qingyu Li <ieatmuttonchuan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 net/nfc/rawsock.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/net/nfc/rawsock.c
+++ b/net/nfc/rawsock.c
@@ -344,10 +344,13 @@ static int rawsock_create(struct net *ne
 	if ((sock->type != SOCK_SEQPACKET) && (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 = &rawsock_raw_ops;
-	else
+	} else {
 		sock->ops = &rawsock_ops;
+	}
 
 	sk = sk_alloc(net, PF_NFC, GFP_ATOMIC, nfc_proto->proto, kern);
 	if (!sk)