[U-Boot] [PATCH 3/5] CVE-2019-14194/CVE-2019-14198: nfs: fix unbounded memcpy with a failed length check at nfs_read_reply

[Cheng Liu]

CVE-2019-14194/CVE-2019-14198: nfs: fix unbounded memcpy with a failed length check at nfs_read_reply

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

Signed-off-by: Cheng Liu <liucheng32 at huawei.com>
---
 net/nfs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/nfs.c b/net/nfs.c
index b7cf3b3..11941fa 100644
--- a/net/nfs.c
+++ b/net/nfs.c
@@ -701,6 +701,9 @@ static int nfs_read_reply(uchar *pkt, unsigned len)
 			&(rpc_pkt.u.reply.data[4 + nfsv3_data_offset]);
 	}
 
+	if (((uchar *)&(rpc_pkt.u.reply.data[0]) - (uchar *)(&rpc_pkt) + rlen) > len)
+			return -9999;
+
 	if (store_block(data_ptr, nfs_offset, rlen))
 			return -9999;
 
-- 
1.8.5.6