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CVE-2019-14195: nfs: fix unbounded memcpy with unvalidated length at nfs_readlink_reply

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

Signed-off-by: Cheng Liu <liucheng32@huawei.com>
Reported-by: Fermín Serna <fermin@semmle.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
This commit is contained in:
liucheng (G)
2019-08-29 13:47:54 +00:00
committed by Joe Hershberger
parent aa207cf3a6
commit cf3a4f1e86
1 changed files with 3 additions and 0 deletions
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3
net/nfs.c
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@@ -634,6 +634,9 @@ static int nfs_readlink_reply(uchar *pkt, unsigned len)
/* new path length */ /* new path length */
rlen = ntohl(rpc_pkt.u.reply.data[1 + nfsv3_data_offset]); 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])) != '/') { if (*((char *)&(rpc_pkt.u.reply.data[2 + nfsv3_data_offset])) != '/') {
int pathlen; int pathlen;