[U-Boot] [PATCH v2 4/5] CVE-2019-14195: nfs: fix unbounded memcpy with unvalidated length at nfs_readlink_reply //RE: [PATCH 4/5] CVE-2019-14195: nfs: fix unbounded memcpy with unvalidated length at nfs_readlink_reply

-- 1.8.5.6 -----Original Message----- From: liucheng (G) Sent: Wednesday, August 21, 2019 10:48 PM To: u-boot@lists.denx.de Cc: liucheng (G) liucheng32@huawei.com Subject: [PATCH 4/5] CVE-2019-14195: nfs: fix unbounded memcpy with unvalidated length at nfs_readlink_reply CVE-2019-14195: nfs: fix unbounded memcpy with unvalidated length at nfs_readlink_reply This patch adds a check to rpc_pkt.u.reply.data at nfs_readlink_reply. Signed-off-by: Cheng Liu liucheng32@huawei.com --- net/nfs.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/nfs.c b/net/nfs.c index 11941fa..915acd9 100644 --- a/net/nfs.c +++ b/net/nfs.c @@ -634,6 +634,9 @@ static int nfs_readlink_reply(uchar *pkt, unsigned len) /* new path length */ rlen = ntohl(rpc_pkt.u.reply.data[1 + nfsv3_data_offset]); + if (((uchar *)&(rpc_pkt.u.reply.data[0]) - (uchar *)(&rpc_pkt) + rlen) > len) + return -NFS_RPC_DROP; + if (*((char *)&(rpc_pkt.u.reply.data[2 + nfsv3_data_offset])) != '/') { int pathlen; -- 1.8.5.6