diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 57e3262ec57a..ee0da259a3d3 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1538,6 +1538,8 @@ nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
 	gdev->gd_maxcount = be32_to_cpup(p++);
 	num = be32_to_cpup(p++);
 	if (num) {
+		if (num > 1000)
+			goto xdr_error;
 		READ_BUF(4 * num);
 		gdev->gd_notify_types = be32_to_cpup(p++);
 		for (i = 1; i < num; i++) {