cid#318900 Out-of-bounds write

Signed-off-by: Caolán McNamara <caolan.mcnamara@collabora.com>
Change-Id: I18f30bbe7271a93a44ce798e358277add9876454

tools/map.cpp

@@ -637,7 +637,7 @@ static unsigned getParent(int proc_id)
 
     char buffer[4096];
     int len;
-    if ((len = read(fd, buffer, sizeof (buffer))) < 0)
+    if ((len = read(fd, buffer, sizeof (buffer) - 1)) < 0)
         error(EXIT_FAILURE, errno, "Failed to read /proc/%d/stat", proc_id);
     close (fd);
     buffer[len] = '\0';