diff -ur mtools-4.0.44/mpartition.c mtools-4.0.44-memleaks/mpartition.c
--- mtools-4.0.44/mpartition.c	2022-10-29 11:48:23.000000000 +0200
+++ mtools-4.0.44-memleaks/mpartition.c	2024-08-21 13:53:03.699524744 +0200
@@ -483,6 +483,7 @@
 				perror("read MBR");
 				exit(1);
 			}
+			close(fd);
 		}
 		memset((char *)(partTable+1), 0, 4*sizeof(*partTable));
 		set_word(((unsigned char*)buf)+510, 0xaa55);