diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c
index 8c589110460a..d656832d82ef 100644
--- a/fs/smb/server/smb2pdu.c
+++ b/fs/smb/server/smb2pdu.c
@@ -878,7 +878,8 @@ int smb2_allocate_rsp_buf(struct ksmbd_work *work)
 		req = smb_get_msg(work->request_buf);
 		if ((req->InfoType == SMB2_O_INFO_FILE &&
 		     (req->FileInfoClass == FILE_FULL_EA_INFORMATION ||
-		     req->FileInfoClass == FILE_ALL_INFORMATION)) ||
+		      req->FileInfoClass == FILE_ALL_INFORMATION ||
+		      req->FileInfoClass == FILE_NORMALIZED_NAME_INFORMATION)) ||
 		    req->InfoType == SMB2_O_INFO_SECURITY)
 			sz = large_sz;
 	}
@@ -6789,7 +6790,7 @@ static int get_file_normalized_name_info(struct ksmbd_work *work,
 {
 	struct smb2_file_alt_name_info *file_info;
 	char *filename, *normalized, *stream_name;
-	int conv_len, filename_len;
+	int buf_free_len, conv_len, filename_len;
 
 	if (work->conn->dialect < SMB311_PROT_ID) {
 		rsp->hdr.Status = STATUS_NOT_SUPPORTED;
@@ -6813,6 +6814,14 @@ static int get_file_normalized_name_info(struct ksmbd_work *work,
 		return -ENOMEM;
 
 	filename_len = strlen(normalized);
+	buf_free_len = smb2_resp_buf_len(work, sizeof(*rsp) +
+					 sizeof(*file_info));
+	if (buf_free_len < 0 ||
+	    (size_t)buf_free_len < (filename_len + 1) * sizeof(__le16)) {
+		kfree(normalized);
+		return -EINVAL;
+	}
+
 	file_info = (struct smb2_file_alt_name_info *)rsp->Buffer;
 	conv_len = smbConvertToUTF16((__le16 *)file_info->FileName,
 				     normalized, filename_len,