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 <liuchen...@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
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