diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 177fefb26c18..eb095f77c39d 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -496,6 +496,14 @@ void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry)
 		return;
 	if (!(entry->fattr->valid & NFS_ATTR_FATTR_FSID))
 		return;
+	if (filename.len == 0)
+		return;
+	/* Validate that the name doesn't contain any illegal '\0' */
+	if (strnlen(filename.name, filename.len) != filename.len)
+		return;
+	/* ...or '/' */
+	if (strnchr(filename.name, filename.len, '/'))
+		return;
 	if (filename.name[0] == '.') {
 		if (filename.len == 1)
 			return;