s3:smbd: allow info class SMB_QUERY_FS_ATTRIBUTE_INFO to return partial data

Reviewed-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Volker Lendecke <Volker.Lendecke@SerNet.DE>
(cherry picked from commit 270d29a743a030653037cb176f3764bec3c79b6c)

diff --git a/source3/smbd/trans2.c b/source3/smbd/trans2.c
index 575f96e816dbe5a96e4567e8bc0d9f94c280e318..fda962c65f5d44e202bb19ce04bedca48e6590f6 100644 (file)
--- a/source3/smbd/trans2.c
+++ b/source3/smbd/trans2.c
@@ -3115,6 +3115,12 @@ cBytesSector=%u, cUnitTotal=%u, cUnitAvail=%d\n", (unsigned int)st.st_ex_dev, (u
                                          STR_UNICODE);
                        SIVAL(pdata,8,len);
                        data_len = 12 + len;
+                       if (max_data_bytes >= 16 && data_len > max_data_bytes) {
+                               /* the client only requested a portion of the
+                                  file system name */
+                               data_len = max_data_bytes;
+                               status = STATUS_BUFFER_OVERFLOW;
+                       }
                        break;
 
                case SMB_QUERY_FS_LABEL_INFO: