File 0018-CVE-2019-14196-nfs-fix-unbounded-me.patch of Package u-boot-cubieboard.16984

Overview Repositories Revisions Requests Users Attributes Meta

File 0018-CVE-2019-14196-nfs-fix-unbounded-me.patch of Package u-boot-cubieboard.16984

From f06d7fbc47d9b1c00cff1475df76fa61907e9745 Mon Sep 17 00:00:00 2001
From: "liucheng (G)" <liucheng32@huawei.com>
Date: Thu, 29 Aug 2019 13:48:02 +0000
Subject: [PATCH] CVE-2019-14196: nfs: fix unbounded memcpy with a failed
 length check at nfs_lookup_reply
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

This patch adds a check to rpc_pkt.u.reply.data at nfs_lookup_reply.

Signed-off-by: Cheng Liu <liucheng32@huawei.com>
Reported-by: Fermín Serna <fermin@semmle.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
(cherry picked from commit 5d14ee4e53a81055d34ba280cb8fd90330f22a96)
Signed-off-by: Matthias Brugger <mbrugger@suse.com>
---
 net/nfs.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/nfs.c b/net/nfs.c
index a8bf184874..dc1a672671 100644
--- a/net/nfs.c
+++ b/net/nfs.c
@@ -566,11 +566,15 @@ static int nfs_lookup_reply(uchar *pkt, unsigned len)
 	}
 
 	if (supported_nfs_versions & NFSV2_FLAG) {
+		if (((uchar *)&(rpc_pkt.u.reply.data[0]) - (uchar *)(&rpc_pkt) + NFS_FHSIZE) > len)
+			return -NFS_RPC_DROP;
 		memcpy(filefh, rpc_pkt.u.reply.data + 1, NFS_FHSIZE);
 	} else {  /* NFSV3_FLAG */
 		filefh3_length = ntohl(rpc_pkt.u.reply.data[1]);
 		if (filefh3_length > NFS3_FHSIZE)
 			filefh3_length  = NFS3_FHSIZE;
+		if (((uchar *)&(rpc_pkt.u.reply.data[0]) - (uchar *)(&rpc_pkt) + filefh3_length) > len)
+			return -NFS_RPC_DROP;
 		memcpy(filefh, rpc_pkt.u.reply.data + 2, filefh3_length);
 	}

Places

File 0018-CVE-2019-14196-nfs-fix-unbounded-me.patch of Package u-boot-cubieboard.16984

Places